In-show deaths

Even though The Simpsons primarily maintains the status quo, throughout the run of the series, several characters, both recurring and one-time, have died. Additionally, many characters have been jokingly killed off during the Treehouse of Horror episodes.

Deaths during the series

Hubert Simpson

The Simpsons shorts

• Hubert Simpson, died in the The Simpsons shorts episode "The Funeral"

Flashbacks

• Clancy Bouvier, In "Jazzy and the Pussycats" Homer says that he died. In "Puffless" it was revealed that he died of lung cancer.
• Snowball I (1988-1990), died after being hit by a car, being driven by Clovis Quimby. The death is first mentioned in "Simpsons Roasting on an Open Fire" with Clovis Quimby being mentioned as the killer in "Treehouse of Horror III".
• Orville Simpson, seen in Heaven by Bart in "Bart Gets Hit by a Car".
• Milton Haas, died from a hernia while carrying the crate of stolen Nazi paintings out of the German castle.
• Sheldon Skinner, Arnie Gumble, Iggy Wiggum, Etch Westgrin and Griff McDonald, killed during a 1979 parade accident
• Johnny, killed by the Vietnamese in a flashback in "I Love Lisa".
• Soldier, eaten by an elephant during the Vietnam War despite Skinner's warning in "Skinner's Sense of Snow".
• C. W. McAllister, died on the Murderhorn mountain in 1928, presumably from altitude sickness as his oxygen was stolen. Abraham Simpson has taken a bite out of his arm. His body was only found in "King of the Hill".
• Waylon Smithers, Sr., died of radiation poisoning. When he was younger Homer Simpson discovered his body, presumably a while after his death as it had quite substantially decayed. Homer had flashbacks of the event when he was hypnotized in "The Blunder Years". Mr. Burns later showed the Simpson family, as well as Chief Wiggum and Waylon Smithers Jr., the footage of his death. Showing that he had died saving Springfield.
• Asa Glick, held a grenade in his hand too long during the First World War and was blown up.
• Child actor, playing Alfalfa on Our Gang, beaten to death by Moe Szyslak as seen in a flashback in "Radioactive Man".
• Viktor's wife, accidentally killed by Wayne Slater by a bullet.
• Mr. Teeny I, II and III, Krusty remarks that he hasn't been this sad since Mr. Teeny III died in "Fraudcast News".
• Pa, died at some point before "How Munched Is That Birdie in the Window?"
• Sheep, stabbed by Mr. Burns and more later died in an explosion in "Moe Goes from Rags to Riches".
• Persian Jimbo, Kearney and Dolph, appeared decapitated in same episode.
• Man about to be executed by axe, stabbed in the head by axe in same episode.
• Bumblebee Man's Parents, shot while playing paintball in "Four Regrettings And A Funeral"
• Grandma Flanders, dies from hearing Ned's song of praise (according to Homer) in "The Kids Are All Fight"

Season 1

• Snowball I, was mentioned to have been run over by a car, which most likely happened somewhere just before the events of the episode Simpsons Roasting on an Open Fire and was replaced by Snowball II.
• Rabbit, possibly died of great height after Homer and Bart's trap flung him in the air. This was seen in "The Call of the Simpsons".

Season 2

• Beetle, eaten by Santa's Little Helper in "Bart's Dog Gets an F"
• Beatrice Simmons, died of a burst ventricle in "Old Money", although Abraham Simpson says that it was actually a "broken heart", after he was unable to attend her birthday party.

Season 3

• Snuffy, Lisa's pet hamster. She recites a poem about his death in "Stark Raving Dad".
• Lincoln Squirrel, mentioned to have been assassinated in "Radio Bart"
• Stinky and Winckels, Bart kills the school fish with a yo-yo, whilst trying the pickle' trick.
• Hamster, died on operating table in "Dog of Death".

Season 4

• Aunt Gladys Gurney, died in "Selma's Choice".
• Numerous people, apparently fall to their deaths after riding on an escalator to nowhere in "Marge vs. the Monorail".
• Truck Driver, most likely perished after going off the road and crashing into a hill in "Krusty Gets cancelled"

Season 5

• Burns' Flying Monkeys,both fall out the window after failing to fly in "The Last Temptation of Homer"
• Boris Simpson, left the Simpsons family his house when he died in "Homer Loves Flanders".
• Man, head exploded by the rising sound effects of the THX cinema in "Burns' Heir".

Season 6

• Bleeding Gums Murphy, died in hospital from illness in "'Round Springfield".
• Superdude, the school gerbil, crushed by his water bottle in "Who Shot Mr. Burns? (Part One)".
• Dr. Marvin Monroe, It was originally thought that Marvin Monroe was dead. In "Who Shot Mr. Burns? (Part Two)", the hospital Burns attends is called The Marvin Monroe Memorial Hospital, and since that, his gravestone has been seen. Most prominently, in The Simpsons 138th Episode Spectacular one of the trivia questions asked was "Which two popular characters have died in the past year?" With the answer being, "If you said Bleeding Gums Murphy and Dr. Marvin Monroe you were wrong, they were never popular," indicating he was dead. However, Marvin Monroe re-appeared ten years later in the episode "Diatribe of a Mad Housewife", saying that he has been "very sick".
• A Man falls into in a sea of lava reaching for a pay phone to answer Bart's call in "Bart vs. Australia".
• Edgar Neubauer, Prudence Goodwife, Buddy Holly, Ritchie Vallens, The Big Bopper, Humphrey Boa-Gart, Mr. and Mrs. Bananas, their tombstones are seen when Bart and Lisa visited the cemetery in "Sideshow Bob Roberts".

Season 7

• An unknown number of people in Shelbyville, presumably died when the Springfieldians knocked Mr. Burns' sun blocker on Shelbyville in Who Shot Mr. Burns? (Part Two).
• Hortense Simpson, died sometime before "Bart the Fink" and left the Simpsons $100 each.
• Asa Phelps, died in "Raging Abe Simpson and His Grumbling Grandson in "The Curse of the Flying Hellfish"", leaving Abraham Simpson and Charles Montgomery Burns as the last two surviving members of their army unit, and the last two in line to inherit the stolen Nazi paintings.
• Mr. Estes, a publications advisor, died and left Lisa Simpson in charge of the school year book, sometime before the episode "Summer of 4 Ft. 2".
• Fish, died when Homer throws a firework into the dishwasher and explodes in "Summer of 4 Ft. 2". It's skeleton can be seen after the explosion.

Season 8

Frank Grimes tombstone.

• James Bont, a James Bond parody, was shot to death by Hank Scorpio's guards in "You Only Move Twice".
• Convicted Man, was about to be executed in Springfield State Prison's electric chair when Hurricane Barbara lifted the roof off the prison and pulled him into the air, ostensibly to safety. He subsequently landed on some power lines and was electrocuted, in "Hurricane Neddy".
• Frank Ormand, the man who gave Marge Simpson the idea to begin a pretzel business. Died in a car crash in "The Twisted World of Marge Simpson".
• The executor of Frank Ormand's will, died in a car crash along with Frank Ormand, in "The Twisted World of Marge Simpson".
• Shary Bobbins, died after being sucked into a jet engine in "Simpsoncalifragilisticexpiala(Annoyed Grunt)cious".
• Frank Grimes, died of electrocution after touching some cables marked "Extremely High Voltage" without safety gloves, whilst impersonating Homer Simpson in "Homer's Enemy". He was alluded to later on in the series in the episode "Natural Born Kissers" when Homer found a program from his funeral in a suit jacket pocket, as well as in "The Great Louse Detective" when Frank Grimes's son tries to murder Homer to avenge his father's death.
• The Fish in Disco Stu's shoes, died presumably because of using up all of the oxygen in their water, or from constant trauma, considering they were in Aquariums in Disco Stu's shoes. Stu explained that he "couldn't get them out of there".
• The Budweiser frogs, eaten by The Coors' gator in "The Springfield Files".
• A man dies after waking up from a 23 years coma in "The Springfield Files".
• Geech, Merl's dog, got accidentally sealed in concrete by his owner in "Brother from Another Series".
• Kissing Fish, eaten by the other one in "El Viaje Misterioso de Nuestro Jomer (The Mysterious Voyage of Homer)".

Season 9

• Boar, killed and eaten by Bart and the other Springfield Elementary School kids, except Lisa in "Das Bus"
• Mouse, stomped by Apu's Elephant in "The Two Mrs. Nahasapeemapetilons"
• Captain Tenille, presumably died when Homer Simpson torpedoed him out of a submarine in "Simpson Tide".

Season 10

• Mr. Pinchy, Homer Simpson's pet lobster, was accidentally cooked to death when the bath water he was in was too hot. An extremely upset Homer ate Mr. Pinchy later at dinner in "Lisa Gets an "A"".
• Red Barclay, died in "Maximum Homerdrive" after a beef-eating contest. Dr. Hibbert, a partner of the steakhouse, says he died of beef poisoning, although it was "probably from some other restaurant".
• Mother bird, Bart Simpson accidentally shots the bird with Nelson Muntz's BB gun. The gun had a crooked sight, which meant that despite the fact that Bart was aiming away from the bird, he still killed it. Bart had to look after her eggs, in "Bart the Mother".
• Many birds presumably killed by Bolivian Tree lizards in "Bart the Mother".

Season 11

• Maude Flanders, died in "Alone Again, Natura-Diddily" when she was knocked off a racetrack grandstand by t-shirts shot from cannons. She was killed off due to problems with her voice actress Maggie Roswell. Maude's death is considered to be the most show-changing death, and affected Ned Flanders in several episodes after the incident.
• Cornelius Chapman, the only man in Springfield older than Mr. Burns (at 108 years old). He died onstage from a heart attack after a kiss on the cheek from Britney Spears. Fittingly enough, he was receiving an award for Springfield's Oldest Man in "The Mansion Family".
• The Laramie Cigarette Team, died when the helicopter exploded at the hands of a Tomacco addicted sheep (who was the only survivor.)
• Duffman, died when Moe put a sticker over his face in "Pygmoelian".

Season 12

• Man having operation, died when a tennis ball landed in his open chest in "Tennis the Menace", after Dr. Hibbert decided to operate on him outside.
• Woman, want on a hunger strike against Duff about not cleaning the lady's room but starved to death, Bart Points out to her skeleton remains later in "Hungry, Hungry Homer".

Season 13

• Professor Huntington, was dying of cancer, in "Homer the Moe" he kills himself by walking in to a lake. He later appears as a ghost.
• Stimson, died of nursling rejection (His death was mistaken to of been Abe Simpson who had passed away).
• Butterfly, burnt to a crisp from heat wave in "Poppa's Got a Brand New Badge".
• Blackout survivor, happy about surviving blackout, but victory is short-lived as he is crushed by Jebediah's statue. Wants to be remembered as a hero before he dies.

Season 14

• Italian Man, shot multiple times by Fat Tony, Legs, and Louie in "The Great Louse Detective".
• Congressman Horace Wilcox, died of a stroke in "Mr. Spritz Goes to Washington".
• Andy, died because he failed with Moe's drink-a-gallon-of-gin challenge "'Scuse Me While I Miss the Sky".
• Cookie, died in "Dude, where's My Ranch?".
• Turtle and skunk, a turtle was crushed to death when Kirk Van Houten accidentally crushed it with a flag in "The Bart of War". The same thing happened to a skunk.

Season 15

• Lawyer, died when Homer drove over him in "My Mother the Carjacker".
• Diver, got electrocuted in "The Fat and the Furriest".
• Fishes, got electrocuted in "The Fat And The Furriest".
• Snowball II, Got rammed by a truck in "I, (Annoyed Grunt)-Bot".
• Snowball III, Drowned in the fishbowl while trying to catch fish in "I, (Annoyed Grunt)-Bot".
• Coltrane, a.k.a. Snowball IV, jumped out of Lisa's window while hearing John Coltrane's music in "I, (Annoyed Grunt)-Bot" and is replaced by Snowball V.
• Nuclear Inspector, died after being rammed by Homer's car in "Diatribe of a Mad Housewife".
• Skin Mite and possibly his family, dissolved by a beauty product on Marge's skin in "The Wandering Juvie".
• Presumably everyone within the Dayton Arms Hotel, when it was obliterated on screen (all the way to the basement) in "Catch 'Em if You Can".
• Presumably everyone in a nearby bus including Duffman in addition to everyone in the Dayton Arms Hotel the twister killed a bus is shown nearby trying to drive away but getting picked up and being thrown away.

  

  The people in the bus meet their fate.

• Elmo, hanged himself in "Bart-Mangled Banner", after being wrongly imprisoned at the Ronald Reagan Reeducation Center.

Season 16

• James Caan, shot many times by Cletus‘s gang.
• Health Inspector Frankie, died when eating one of Moe Szyslak's pickled eggs in "Mommie Beerest".
• Mario, hit by a trash can thrown by Homer in "Homer and Ned's Hail Mary Pass". This is a reference to Donkey Kong, being the trash can a parody of a barrel.
• Los Lobos, along with several other unnamed celebrities, like Kathy Griffin, died after falling out of a blimp.
• Lisa's Hamster, Lisa mentioned that Bart tried to cheer her up after her hamster's death, when she was young in "On a Clear Day I Can't See My Sister".
• Bart's turtle, dies for unknown reason and Bart asks Homer to save her during the shock therapy in "Don't Fear the Roofer".

Season 17

• Buried Man, a man who was buried alive by Gravedigger Billy in "The Girl Who Slept Too Little ".
• Bird Egg, eaten by Nelson but was later attacked by other birds in "The Last of the Red Hat Mamas".
• Fred Kanneke, Chief Wiggum's brother-in-law who was given euthanasia in Million Dollar Abie.

Season 18

• The Callibricis, the rival gang of Fat Tony's, died of food poisoning. Seen in "The Mook, the Chef, the Wife and Her Homer".
• The Callibricis' Goons,with the exception of Joey (mafia) died in a car explosion.
• Amber Simpson, Homer's Vegas wife died of an overdose whilst in front of a "Do not stand up on the roller coaster" sign. Her funeral was seen in "Jazzy and the Pussycats".
• Max, an ice cream truck driver. Died whilst giving Homer change for a $100 in "Ice Cream of Margie (with the Light Blue Hair)".
• Diver, drowned, when Nelson stole his equipment in "The Haw-Hawed Couple".
• Possibly many of the population of Shelbyville is apparently killed when an atomic bomb detonates there in "24 Minutes".
• Cottontail, Bart's rabbit. He was only mentioned in The Boys Of Bummer by Lisa, when she tells Bart he died and Homer buried him-but not in that order.

The Simpsons Movie

• Green Day, killed when the boat they were playing on flipped over. The Springfield residents later pray for them in church.
• Fishes in Lake Springfield, Electrocuted by Homer with a Bug-zapper.
• Panicky Man, crushed by the dome as it was being installed over Springfield, killing him.
• Dr. Nick, crushed by piece of the dome that landed on his groin, saying "Goodbye everybody!". It turns out he hadn't been killed and makes several appearances in later episodes.

Season 19

• People Reviewing Sundance Films, died from loss of breath in "Any Given Sundance".
• Mona Simpson, dies of old age in "Mona Leaves-a".

Season 20

• Mrs. Gumble, died sometime before "Double, Double, Boy in Trouble".
• Howard, Sr., died sometime before "Wedding for Disaster".
• Fly, squashed by Homer's head in "The Good, the Sad and the Drugly".

Season 21

• Gypsy, in the couch gag for 'Boy Meets Curl' She reads Grampa's Fortune of Death so he turns it to her causing her to instantly die.
• Every ant from Lisa's ant farm except for one named Annie, eaten by Santa's Little Helper in "American History X-cellent".
• Annie, eaten by Santa's Little Helper just as she was released in the wild.
• Bluella, died in "The Squirt and the Whale" after she was washed up on the shore of Springfield.

Season 22

• Raymond Bird, eaten by Santa's Little Helper in "How Munched Is That Birdie in the Window?".
• Fat Tony dies, presumably of a heart attack -- because he couldn't take it that Homer betrayed him -- in "Donnie Fatso." Fit Tony took his cousin's place running the Springfield mob.
• The Only Woman for Moe, hangs herself after thinking there was no man for her in The Blue and the Gray.
• People On Airplane presumably die in a plane crash when Patty and Selma remove their smoke and ash from their hair and causes the plane to crash in "The Blue and the Gray".
• The Hardy Boys are in the ground with gravestones at their head in "500 Keys when Lisa asks what "Nancy Drew would do.
• Nancy Drew only minutes later in Lisa's dream-bubble, "Nancy Drew" is lying in the ground next to "The Hardy Boys".

Season 23

• Viktor, Wayne Slater threw an ice pick at his throat in "The Falcon and the D'ohman".
• Alice Glick, killed by a rogue seal robot in "Replaceable You".
• 35 people were killed during the reign of "Spring face" in The D'oh-cial Network.

Season 24

• Steve Mobbs, died sometime before "A Tree Grows in Springfield".
• Frog, zapped by Chief Wiggum.

Season 25

• Chip Davis, died in "Four Regrettings and a Funeral".
• Lyla, died in "Four Regrettings and a Funeral".
• Edna Krabappel, implied to be deceased in "The Man Who Grew Too Much", the message on the chalk board reading "We'll miss you Mrs. K", she was also never a character in Season 25.

Season 26

• Rabbi Hyman Krustofsky, dies of natural causes in "Clown in the Dumps".
• Albert, died after attempting to stand on his own in "Walking Big & Tall".
• Squawky, killed by the engine of Elon Musk's flying vehicle

Season 27

• Unnamed Pit Master, died of an unknown cause, he appeared to Homer as a ghost in the clouds in "Cue Detective"
• Cupid shot by Cletus in "Love Is in the N2-O2-Ar-CO2-Ne-He-CH4".
• Nibbles the class hamster dies after being neglected by Lisa in "Lisa the Veterinarian".
• Grand Canyon visitor possibly died after being crushed by falling boulders in "Fland Canyon".
• Grand Canyon Restaurant waitress's Brother died after being sentenced to death by electric chair in "Fland Canyon".
• Lenny's Grandmother possibly died during "Simprovised". It's mentioned that she's very sick, and later in the episode, Lenny mentions that the hospital "left a message" and leaves the room crying.

Season 28

• Dr. Nussbaum died after an appointment with Mr. Burns during Friends and Family.

Future episodes

• Many Mosquitoes, hit by the Simpsons' car windshield in "Bart To The Future".
• Homer Simpson, dies 50 years later in "Barting Over".
• Homer and Marge Simpson, become ghosts 60 years later in "The Boys of Bummer".
• Ralph Wiggum, accidentally shoots himself in the head.
• Ralph Wiggum Clone #1, hit by truck in "Holidays of Future Passed".
• Ralph Wiggum Clone #2, crashes truck.
• Numerous Ralph clones, set on fire as a result of the truck crash.
• Bart Simpson, pulled apart by snowmobiles, as revealed 1000 years later in The Father, the Son and the Holy Guest Star.
• Sanjay Nahasapeemapetilon, Capital City Goofball, Sideshow Bob and Edna Krabappel, revealed to have died sometime before 30 years later in Holidays of Future Passed.
• 127 Homers, die for different reasons in "Days of Future Future".
• Scruffy, shot himself in the head with a laser gun in Simpsorama, because he realized life was not worth living without a moustache, however during the credits his body is shown moving while sweeping the ground without a head.
• Grampa Simpson, died sometime in "Barthood".

Note: These episodes are not considered canon.

Fictional characters

Itchy and Scratchy usually get killed (mostly Scratchy) in their episodes.

Season 2

• Cartoon Squirrel, gets her head swung off by Itchy's Bat in "Itchy & Scratchy & Marge".

Season 8

• Poochie, died on the way back to his home planet during an episode of the Itchy & Scratchy Show in "The Itchy & Scratchy & Poochie Show". He was killed off due to immense unpopularity. However, he still appears as a background character from time to time, so he may not actually be dead. For example, he appeared in non-canon segment "The Terror of Tiny Toon" in "Treehouse of Horror IX".

Season 14

• Eric Cartman, Head cut off by O.J. Simpson in A South Park Episode Bart & Milhouse were watching.
• Farty the Crippled Robot, head cut off By O.J. Simpson in a South Park episode Bart & Milhouse were watching.

Season 15

• Mr. O'Bannon, a character in the Video Game Hockey Dad killed in the fight. played by Milhouse.

Season 18

• Greystach, a character in the Angelica Button series, is killed by Malicious Krubb after he tries to save Angelica Button.
• Officer Joe, a character in Ned Flanders movie kills himself after says "WANTED OFFICER JOE" send to hell in "The Wife Aquatic".

Season 24

• Silly Squirrel gets murdered by an acquaintance in The Saga of Carl. 

  

  Comic Book of the death of radioactive man

Season 25

• Radioactive Man, died in Married to the Blob.

Treehouse of Horror deaths

Note: Treehouse of Horror deaths are kept separate due to the nature of Treehouse of Horror episodes. Treehouse of Horror episodes aren't continuous with the rest of the series, giving the writers the possibility of killing off important characters without having to create a replacement or write them out of the series. (e.g. in Treehouse of Horror XV, Homer obliterates Springfield, but the series continues on.)

Treehouse of Horror

• Marge Simpson (as Lenore), referred to as "Lost Lenore" in "The Raven" segment of an unknown cause.

Treehouse of Horror III

• Milhouse Van Houten, Homer crushed him when slamming the door on him.
• Killer Krusty Doll {possibly} killed when he got switched to good
• Lenny Leonard, eaten by King Homer.
• Waylon Smithers, eaten by King Homer.
• Shirley Temple, eaten by King Homer.
• Dave Shutton, crushed by King Homer.
• Clancy Bouvier, eaten by King Homer.
• Principal Skinner, turned into a zombie
• Martin Prince (possibly), turned into a zombie when Principal Skinner as a zombie told him to bring his big juicy chess-club brain along with him
• Krusty the Clown, turned into a zombie when Zombie Sideshow Mel bit him
• Jimbo, Dolph, Kerney, turned into zombies (they still bullied Zombie Skinner, by kicking Skinner's head)
• Nelson Muntz (possibly), may have turned into a zombie
• Numerous zombies (Ned Flanders, Albert Einstein, Thomas Pynchon, William Shakespeare, Edna Krabappel, and George Washington), killed mainly by Homer when zombies attack Springfield.

Treehouse of Horror IV

• Groundskeeper Willie's mule, Willie comments that he had to put seventeen bullets in him.
• Hans Moleman, killed when his car explodes. 
• Ned Flanders, killed by a gremlin through decapitation. (Although he was still able to speak.)
• Bart Simpson, bitten by Mr. Burns who was a vampire, turned into a vampire.
• Charles Montgomery Burns (Vampire), died of a stake through heart by Homer after first staking his crotch.
• Milhouse Van Houten, Janey, Ralph Wiggum and Martin Prince, turned into vampires.

Treehouse of Horror V

• Moe Szyslak, hung.
• Patty and Selma Bouvier, burned at the stake by Reverend Lovejoy.
• Edna Krabappel, Homer Simpson, Charles Montgomery Burns, Groundskeeper Willie, Clancy Wiggum, and Seymour Skinner, heads chopped off by Bart.
• Groundskeeper Willie, stabbed in the back with an axe in each of the three mini-episodes, all while trying to help the main character of the episode. In the third death he replies that he's "bad at this."
• Patty Bouvier, revealed to have died in an alternate universe. The cause of her death, however, is not mentioned.

  

  Willie Stabbed by Homer

• Selma Bouvier, revealed to have died in an alternate universe. The cause of her death, however, is not mentioned.
• Mosquito, squashed by Homer.
• Walking fish, sat on by Homer.
• T-Rex and other dinosaurs, dies from a spreading cold when Homer sneezed at the T-Rex.
• A big dragonfly, beaten to death by Homer.
• Lizard, stepped on by Homer.
• Jimbo Jones, cooked by Skinner and turned into Sloppy Jimbos.
• Üter, cooked by Skinner and turned into Uterbraten.
• Milhouse Van Houten, Bart and Lisa Simpson, fell in a giant blender. Bart woke up just as he and Lisa were about to die.

Note that the people killed in the third segment didn't die because it was in Bart's nightmare.

Treehouse of Horror VI

• Martin Prince, strangled to death by Willie in his dreams. Others including Sherri and Terri, Nelson Muntz, Ralph Wiggum, Jimbo Jones, Kearney Zzyzwicz, and Dolph Starbeam were all killed by Willie in several ways.
• Santa's Little Helper (possibly) When kicked by Lard Lad mascot.
• Otto Mann, and a school bus of kids, unknown if they got killed by a billboard of the Devil come to life. But Otto appeared at the end of the episode.
• Mascots including Lard Lad, were all killed since nobody looked at them during the musical sequence.
• Seymour Skinner, Nelson Muntz, Kearney Zzyzwicz, Dolph Starbeam, J. Loren Pryor, Jimbo Jones, Doris Freedman, Gary Chalmers and Groundskeeper Willie, Possibly crushed when the devil destroyed the school through Bart's orders.
• Captain of the High School Basketball team, shot by Clancy Wiggum who thought he was a monster.
• Homer Simpson, possibly killed when he collapsed into pieces in the third dimension (although still alive when he stumbles to the real human world)
• Groundskeeper Willie, burnt in fire and turned into a black skeleton (although he could still move and talk).

Treehouse of Horror VII

• The Simpsons, killed after seeing a Grim Reaper near their couch.
• Bill Clinton and Bob Dole, ejected into space, completely naked and died off-screen because there is not oxygen in space.

Treehouse of Horror VIII

• FOX Censor, stabbed to death.
• Edna Krabappel, Elizabeth Hoover, Herman Hermann, Jeffrey Albertson, Kirk Van Houten, Brandine Spuckler, Luann Van Houten, Milhouse Van Houten, Rod Flanders, Todd Flanders, Helen Lovejoy, Bumblebee Man, Timothy Lovejoy, Jr., Krusty the Clown, Charlie, Gary Chalmers, Lindsey Naegle, Jeremy Freedman, Joe Quimby, Kent Brockman, Luann Van Houten, Agnes Skinner, Jessica Lovejoy, Nelson Muntz, Sherri, Terri, Grampa Simpson (possibly), and Old Jewish Man, killed by the bomb turning them into skeletons.
• Many Springfieldians, killed when the neutron bomb hits Springfield. Homer and the rest of the Simpsons family are the only survivors, while several others are turned into mutants (including Charles Montgomery Burns, Barney Gumble, Apu Nahasapeemapetilon, Carl Carlson, Lenny Leonard, Moe Szyslak, Sideshow Mel, Waylon Smithers, Jr., Clancy Wiggum, Ned Flanders, Cletus Spuckler, Otto Mann, Seymour Skinner, Lionel Hutz, Groundskeeper Willie, Captain Horatio McCallister and Dr. Hibbert) but then shot by Marge Simpson, Bart Simpson, and Lisa Simpson.
• Johnny and Edgar Winter, run over by Homer, who mistook them for mutants.
• Luann Van Houten, Agnes Skinner and Elizabeth Hoover, all were burnt at the stake because they were accused of being witches. NOTE: Bernice Hibbert was possibly accused as a witch since Ned Flanders mentioned they killed many witches but Bernice Hibbert was not seen in the episode so she's most likely to be dead.

Treehouse of Horror IX

• Homer Simpson, hit by Marge Simpson's car.
• Lisa Simpson, crashed into a wall on her bike.
• Bart Simpson, accident on his skateboard.
• Snake Jailbird, electrocuted in an electric chair.
• Apu Nahasapeemapetilon, drowned in a Squishee machine by Homer Simpson.
• Moe Szyslak, Homer Simpson pulled his heart out with a corkscrew.
• Poochie, hit by a police car driven by Itchy and Scratchy.
• The Jerry Springer's Show Audience, incinerated by Kang's death ray.
• Jerry Springer, suffocated by Kang's tentacle, he was also possibly killed from a venomous bite of the alien/human hybrid Maggie Simpson.

Treehouse of Horror X

• Lisa Simpson, disintegrated by an alien Maggie from Treehouse of Horror IX.
• Ned Flanders, hit by a car. However, he reappeared as a zombie werewolf, so now he is undead.
• Homer Simpson, possibly killed by werewolf Ned Flanders.
• Comic Book Guy as The Collector, killed by Lucite when he fell to the plastic water.
• Nelson Muntz, falls into copying machine.
• Krusty the Klown, killed by a pace maker inside his stomach. (Although he shouted "I'm not dead" which means he's alive, also Bart was upset about this.)
• Homer Simpson and Bart Simpson, blown up after escaping the spaceship going into the sun, died because of no oxygen in space.
• Celebrities on doomed spaceship, died when their spaceship flew into the sun.

Treehouse of Horror XI

• Homer Simpson, killed by an angry mob.
• Bart Simpson, killed by an angry mob.
• Marge Simpson, killed by an angry mob.
• Abraham Simpson, killed by an angry mob.
• Homer Simpson, choked to death on a piece of broccoli, twice.
• Agnes Skinner, dropped to her death by Ghost Homer when he tries to do a good deed.
• Simpson children, Bart and Lisa see their siblings’ skeletons.
• Goldilocks, mauled by Daddy Bear, Mummy Bear and Baby Bear.
• Rapunzel, implied to be dead after her own scalp is ripped by Homer.
• Suzanne the witch burnt to death
• Lenny Leonard killed by Dolphins(Although was seen in the battle)
• Captain Horatio McCallister, killed by dolphins.
• Squeaky-Voiced Teen, killed by dolphins.
• Kent Brockman killed by dolphins.
• Many people including: (Apu Nahasapeemapetilon, Akira, Comic Book Guy, Carl Carlson, Reverend Lovejoy, Hans Moleman, Gil Gunderson, Raphael, Fat Tony, Louie, Legs, Luigi, Luann Van Houten, Lunchlady Doris, Montgomery Burns,Waylon Smithers, Disco Stu, Cookie Kwan, Judge Constance Harm, Lionel Hutz, Sideshow Bob, and Arnie Pye) all died in the battle.
• Abraham Simpson, eaten by a dolphin, though a deleted scene shows him bursting out of the dolphin and joining in Springfield's battle against the dolphins.
• Groundskeeper Willie, killed by dolphins.
• Krusty the Clown, drowned in the sea off-screen.
• Homer, Marge, Bart, Lisa and Maggie Simpson （possible）, Old Jewish Man, Dr. Julius Hibbert, Charlie(SNNP), Bernice Hibbert, Moe Szyslak, Barney Gumble, Ned Flanders, Sideshow Mel, Millhouse Van Houten, Kirk Van Houten, Chief Wiggum, Lou, Eddie, Ruth Powers, Seymour Skinner, Agnes Skinner, Mayor Joe Quimby, Dr. Nick Riviera, Nelson Muntz, Jimbo Jones, Kearney Zyzzwicz, Dolph Starbeam, Jasper Beardley, Snake Jailbird, Dave Shutton, Sam and Larry, Manjula Nahasapeemapetilon and the Octuplets, Ralph Wiggum, Lindsay Neagle, Edna Krabapple, Professor John Frink, Superintendant Chalmers, Helen Lovejoy, Miss Springfield, Bumblebee Man, Sherri and Terri,Uter Zorker,Duffman,Rich Texan, Charlie, Dredrick Tatum, Artie Ziff, and many others, Survived、Drowned and left stranded in the sea.(Debate,because some characters e.g：Otto Mann or any people（s） absent in this story.)
• Note：Rainier is few Springfield locals not appear in 3rd Story.

Treehouse of Horror XII

• Waylon Smithers, electrocuted.
• Simpson family, shredded by Mr. Burns' gate after running through it.
• Lenny Leonard, crushed and killed by a helicopter that crashed on Moe's.
• Carl Carlson, crushed and killed by a helicopter that crashed in Moe's.
• Moe Szyslak, drowned off-screen in a pickled egg jar
• Bart Simpson, drowned himself in his cereal off-screen.
• Count Montymort, stabbed in enchanted shin (the source of his power) by Bart Simpson and Slithers eats him.

Treehouse of Horror XIII

• Homer clone, electrocuted.
• Ned Flanders, decapitated with a chainsaw by Homer clone.
• 3 Homer clones that knew the way home, shot by Homer.
• Gil Gunderson, killed by Homer clones, although he was still moving and speaking.
• All Homer clones but one, fall off a cliff.
• Real Homer Simpson, falls off a cliff.
• Zombies, shot.
• Future Homer Simpson, shot by Moe.
• Little Eyes, Eaten by Sinister Eyes.
• Professor Frink, eaten after being turned into a turkey.
• Bird, eaten by Marge.

Treehouse of Horror XIV

• Homer Simpson, shot by Marge.
• Grim Reaper, murdered by Homer with a bowling ball.
• Homeless Guy, received the touch of death by Homer the Grim Reaper so students could watch him harvest a soul.
• Jasper, received the touch of death by Homer.
• Crowd at the baseball game (Including Lindsey Naegle, Kirk Van Houten, Reverend Lovejoy and Hans Moleman), all received the touch of death by Homer (except the Queen who got hit by a baseball).
• Patty Bouvier, killed by Homer instead of Marge.
• Ned Flanders, killed by Professor John Frink Sr after he rips out his heart.
• Seymour Skinner, killed by Professor John Frink Sr. after he rips out his spine. Note that he was still moving and talking but he was not seen later sneaking to get revenge so he probably died.
• 5 scientists, brains removed by Professor John Frink Sr.
• Sideshow Mel, Very Tall Man, Bumblebee Man, Superintendant Chalmers, Eddie, Snake Jailbird, Reverend Lovejoy, Otto Mann, Cletus Spuckler, Clancy Wiggum and Apu Nahasapeemapetilon. Killed by Professor John Frink Sr. by ripping their body parts.Other characters (including Disco Stu, Nelson Muntz, Kearney Zzyzwicz, and Charles Montgomery Burns) Survived.
• Professor John Frink Sr., died form a calculated kick to the groin from Professor John Frink Jr.
• Martin Prince, died, or was seriously injured while being attacked by the angry mob.

Treehouse of Horror XV

• The Simpson family (except for Bart), cooked by Kang and Kodos.
• Dr. Hibbert, falls out of a window.
• Hans Moleman, dropped down a sewer and devoured by crocodiles.
• Homer Simpson, shot by Ned thrice. The rest of the Springfield including (Ned Flanders, Marge Simpson, Lisa Simpson, Bart Simpson, Maggie Simpson, Chief Wiggum, Carl Carlson, Montgomery Burns, and Barney Gumble) were all killed by a bomb.
• Prostitute, killed by Clancy Wiggum.
• Ned, Todd and Rod Flanders, their heads hang in Comic Book Guy's shop.
• Comic Book Guy, killed by Clancy Wiggum.
• Selma Bouvier, killed by Clancy Wiggum. note she was still talking and moving when bart said if she died 5 minutes ago but then she went back to dead.
• Clancy Wiggum, possibly died on a balloon crash after getting hit by Kang and Kodos spaceship.

Treehouse of Horror XVI

• David, sliced in half by Bart.
• Lenny, Carl, Barney, Bumblebee Man, Reverend Lovejoy, Sideshow Mel, Mr. Largo, Dr. Nick, Dr. Hibbert, Principal Skinner, Groundskeeper Willie, Apu, Otto, Lou, Squeaky-Voice Teen, Kirk Van Houten, Kent Brockman, Comic Book Guy, Blue Haired Lawyer, Krusty the Clown, Yes Guy, Captain McAllister all shot by Mr. Burns (note: Apu was killed twice when he got reincarnated as a rabbit but got trapped in a bear trap).
• Moe and Chief Wiggum, impaled on a weather vane.
• Professor Frink, eaten by Homer.
• Mr. Burns and Smithers, hit on the head with a frying pan by Marge. (Burns and Smithers may not by dead, they might be unconscious)
• Disco Stu, arrow through the head. (a la Steve Martin)
• Mayor Quimby, eaten by dogs.
• Martin Prince, sprayed by Groundskeeper Willie.
• Mouse, eaten by Bart who show his special power to everybody.
• Abraham Simpson, It is unclear as to whether he is killed or not, but it is likely he would be listed as dead after Dr. Hibbert (who had became a vampire) flew off into the night with him. Abraham said, "That's it, suck out the poison...Wait a minute...Ahhhhh!" Implying that he had either been turned into a vampire (which would technically make him undead) or had been killed due to blood loss.

Treehouse of Horror XVII

• Moe Szyslak, killed by an iron maiden.
• Snowball V, eaten by Homer Simpson.
• Squeaky-Voiced Teen, eaten by Homer.
• Üter, eaten by Homer.
• German Peoples at Oktoberfest, eaten by Homer.
• Fat Tony, eaten by Homer.
• Comic Book Guy, eaten by Homer.
• Peoples in Umpire School, eaten by Homer.
• Peoples from "The Facts of Life Reunion Tour", eaten by Homer.
• Guys in Hawaiian shirt store, eaten by Homer.
• Peoples on a bus, eaten by Homer.
• Ned Flanders, had his head bitten off by Homer.
• Dr. Phil McGraw, eaten by Homer.
• Homeless Peoples, eaten by Homer.
• 17th Century Peoples, shot by the Golem of Prague in a flashback.
•  Krusty was not seen a the end of the episode.
• Bart's turtle, gets killed by Homer when he's passed out. (only mentioned, not actually seen)
• Jimbo, Nelson, Dolph, and Kearney die after the Golem switches their heads. NOTE: Nelson was not seen on the screen or seen when heads were switched because the golem threw his head off
• Principal Skinner, sliced in half by the Golem of Prague. (However, he still moved and talked before being put in a bag, but he is listed by Chief Wiggum as dead, so he is probably killed by the Golem.)
• Barney Gumble, hit with a bat by Moe.
• Lenny Leonard, shot by Homer, who thought he was an alien.
• Disco Stu, shot by Homer, who thought he was an alien.
• Captain McAllister, decapitated by Homer.
• Clancy Wiggum, sucked dry by Kang and Kodos's spaceship.
• Many Springfieldans, all killed in Kang and Kodos' invasion.

Treehouse of Horror XVIII

• American Idol logo, sucked away in a hoover by Marge.
• Football on Fox logo and Football players, sprayed by Marge.
• Cops Police man, melted by Marge.
• 24 Guy, stuck on the fridge by Marge. (but still alive)
• House Guy, put in a microwave by Marge and exploded.
• Prison Break Prisoners, scared away by Marge.（but still alive）
• Three soldiers, killed by Kodos.
• Various Rigellian IV Aliens - Killed by USA troops.
• Kang is shot.
• Kodos is suffocated.
• Kent Brockman, killed by Marge.
• Five men, Disco Stu and Captain MacAllister, accidentally shot by Homer.
• Grampa, accidentally killed by Homer and Marge when they were trying to kill each other.
• Chief Wiggum, shot in the chest with an arrow by Marge
• Principal Skinner, killed by Marge and Homer (although was still talking)
• Track Driver and many people in Hotel, Die when Hotel destory.
• Barney Gumble, was set on fire by Bart, Milhouse, Nelson, and lisa or Jimbo, Kearney, and Dolph. Since they were seen in hell.
• Principal Skinner, killed by a school bus drive by Tod and Rod.
• Groundskeeper Willie, killed by his killer tractor.
• Dr. Hibbert, run down by a van.
• Homer, killed when he is cut to pieces through his own hammock and his head turned to spaghetti.
• Moe Szyslak, Kick by Woman.

Treehouse of Horror XIX

• Homer, killed by voting booth when he gets sucked into it and shot out afterwards.
• Grandpa Simpson, possibly died after passing out in the Simpson's front yard.
• People On Plane (including Superintendant Chalmers), coughed out by Plane Robot onto runway.
• Various People Throughout Springfield, probably killed during robot battle. (This includes Otto since he was in that episode but was not seen later on at the end with the others, but it is uncertain if he died.)
• Krusty the Clown, shredded by a woodchipper.
• George Clooney, The Rich Texan, Prince, Neil Armstrong, Kate Winslet and other celebrities (Debate from some past celebrities e.g:George and Abraham.) all killed by Homer (George Clooney drowned in quicksand, Prince was strangled with his guitar by Homer and stabbed, Neil was hit and became unconscious from a flying golf club and Kate may be drowned in chocolaties.).
• Edna, Artie Ziff, Carl, Lenny, Barney, Moe, Lou, Eddie, and Sideshow Bob killed by deceased celebrities that came down from heaven.
• Chief Wiggum(possibly), Shot by the deceased Edward G. Robinson.
• Homer, head blasted off by the deceased Krusty the clown
• Principal Skinner, possibly killed after his head cut off revealing his brain by Grand Pumpkin. (But Skinner said "Part of my brain?".)
• Nelson Muntz, eaten by Grand Pumpkin, then possibly eaten by Tom Turkey
• Kang (possibly), killed by Grand Pumpkin
• Kodos (possibly), killed by Grand Pumpkin
• Jeff Boomhauer and Dale Gribble killed by Tom Turkey
• Grand Pumpkin, killed by Tom Turkey.
• Many Students at the Party (including Richard, Nina Skalka, Francine Rhenquist, Lewis Jackson, Ralph Wiggum, Jimbo Jones, Nelson Muntz, Kearney Zzyzwick, Dolph Starbeam, Shauna, Jessica Lovejoy, Sherri and Terri, Bart Simpson, Lisa Simpson(fled possibly), Milhouse(fled possibly), and Nikki.), eaten by Tom Turkey at the party.

Treehouse of Horror XX

• Homer Simpson, head gets chopped off and it falls in the punch bowl at the party.
• Miss Hoover, beheaded off-screen by Bart.
• Principal Skinner, beheaded off-screen by Bart.
• Alfred Hitchcock，fall onto Death.
• Bart Simpson, accidentally killed by Lisa with a knife in his head.
• Helen Lovejoy (as a muncher), shot by Marge with a gunshot.
• Sideshow Bob, Gina Vendetti, Snake Jailbird, Grampa Simpson, Lenny Leonard, Carl Carlson, Barney Gumble, Nelson Muntz, Dolph Starbeam, Kearney, Ralph Wiggum, Arnie Pye, Agnes Skinner, Superintendant Chalmers, Sara (Springfield Elementary Student), Francine Rhenquist, Luann Van Houten, Cookie Kwan, Lugash , Rod Flanders, Todd Flanders, Hubert Wong and many others, were all bitten by munchers then turned into a muncher.
• Jessica Lovejoy (possibly), killed by munchers, then turned into a muncher.
• Apu Nahasapeemapetilon, killed by munchers
• Rainier Wolfcastle, killed by munchers.
• Moe Szyslak, presumably killed when he was taken by munchers Lenny, Carl, and Barney.
• Hans Moleman, Ned Flanders, Bumblebee Man, Otto Mann, Sam, Larry, Comic Book Guy, Lurleen Lumpkin, Arnie Pye, Louie and Charlie, all ran over by car.
• Squeaky-Voiced Teen, killed by muncher Kent Brockman.
• Dr. Hibbert, killed by munchers.
• Mr. Burns, killed by Homer.
• Waylon Smithers, killed by Homer.
• Homer Simpson, turned into a muncher by Muncher Mr. Burns (although Homer can still talk to Marge, Lisa, and Bart)
• Doctor munchers, killed by Dr. Hibbert.

Treehouse of Horror XXI

• Bart, beaten to death by Homer with a tombstone.
• Professor Frink, killed by aging himself with a DVR remote. (Start)
• Alien inside Frink‘s stomach, may also die when Frink into dust.
• Chief Wiggum, squashed by a giant Knight piece in Chess.
• Julius Hibbert, Moe Szyslak, Otto Mann, Edna Krabappel, Apu, Seymour Skinner, Ned Flanders, Luigi, Jimbo, Nelson, Kearney, Dolph, Krusty the Clown, and Bumblebee Man, possibly crushed by Slinkies
• Rod and Todd Flanders, squashed in a tumbling block game.
• Cards, shot by Bart.
• Milhouse, suicide by drowning.
• Bart and Milhouse (again after being resurrected) possibly strangulated with ropes.
• Seagull, poisoned.
• Pelican, stabbed with a marlin thrown by Homer at the end.
• Shark, Squid and other sea life, killed by fuel from the Rent-a-Dream.
• Roger, harpooned by Homer.
• Albatross crew, various weapon's including - anchor, flare gun, blunt weapon by Homer covering up murder of Roger.
• Marge, poisoned herself with a poisoned pie because of the guilt of Homer killing the Albatross crew.
• Homer Simpson, possibly killed by sliding down from the Drops and Rises game.
• Ned Flanders, cooked for dinner.
• Big Bird - killed by Count von Count.
• Count Dracula and Edmund (possibly) - Homer's blood which was filled with cholesterol.
• Homer - when a bat, could not fly (possibly) due to his weight and fell to his potential death.

Treehouse of Horror XXII

• Charles Montgomery Burns, Snake Jailbird, Patty and Selma, Sideshow Bob, killed by Ned Flanders under Homer's order.
• Homer, choked by God.
• Two Squirrels, Heads are bitten.
• Superintendent Chalmers, Eddie, Lou, Apu, Seymour Skinner, Lenny Leonard, Carl Carlson, Moe Syzslak, Barney Gumble, Otto Mann, Comic Book Guy, Cletus, Brandine, Jimbo Jones, Kearney Zyzzwicz, Dolph Starbeam, Nelson Muntz, Lisa Simpson, Ralph Wiggum and Snake Jailbird killed by the inhabitants on Rigel 7.

Treehouse of Horror XXIII

• Aztec Moe Syzlak, burlap sack wrapped around head and is decapitated by a guard.
• Homer Simpson, crushed by a Mayan God.
• Everyone, crushed by the Mayan gods when they destroyed people's buildings as well as blowing up the entire planet.
• Sideshow Mel, had his skeleton sucked away by the black hole.
• Chief Wiggum, eaten by the devil and turned into a skeleton.
• Scratchy, had his chest impaled on a faucet and had his blood poured out of it.

Treehouse of Horror XXIV

• Kaiju Three Eyed Crow, Struck by lightning.
• Lard Lad Mascot, Eaten by a Chief Wiggum Cyclops.
• Edna Krabappel, Attacked and possibly devoured by Alfred Hitchcock's birds (Debatable).
• Jimbo Jones,  Nelson Muntz, Kearney Zyzzwicz and Comic Book Guy, Turned into munchers.
• Lenny Leonard and Ralph Wiggum, Decapitated.
• Fairy Waylon Smithers, Eaten by Monster Mr. Burns.
• Millhouse, Eaten by Kaiju Blinky, after being pushed over the bridge by Maggie on her haunted car.
• Montgomery Burns, Superintendent Chalmers, Agnes Skinner, Ms. Hoover, Moe Szyslak, Principal Skinner, Barney Gumble, Reverend Lovejoy, Helen Lovejoy, Kirk Van Houten, Luann Van Houten, Cookie Kwan, Squeeky Teen, Bumblee Man, Duffman, Disco Stu, Krusty, Sideshow Mel, Apu, Cletus, Groundskeeper Willie, Nick Riviera, and Julius Hibbert, possibly killed by monsters.
• Homer Simpson, Squashed by the car Maggie was driving
• Some fairies, flew into the TV, got electrocuted and fell.
• Mr. Burns, Turned into Roast vulture by the Fat in the Hat.
• Waylon Smithers, Burned.
• Moe Syzslak, Skinned by the Fat in the Hat.
• Patty and Selma, killed by the Fat in the Hat.
• Ralph Wiggum, Speared to death.
• Krusty Bull, Beheaded by Sideshow Bob.
• Homer Simpson (The Fat in the Hat), Stabbed by Maggie and converted in a carpet.
• Jimbo Jones, Kearney Zyzzwicz and Dolph Starbeam, Eaten by circus lion.
• Kang and Kodos, Suffocated by Mr. Burnsrum.
• Mr. Burnsrum, Hanged to death off-screen by freaks Moe Syzslak, Barney Gumble, Lenny Leonard, Carl Carlson, Nelson Muntz, Comic Book Guy, Cletus and Brandine, Wiseguy, Mr. Teeny and Maya.
• Homer Simpson along with Babe Ruth and Stalin, all died (shown on the newspaper)

Treehouse of Horror XXV

• Homer Simpson, eaten the small intestine himself.
• Bart Simpson, decapitated by Lisa Simpson.
• Jennifer Lawrence, Warren Beatty, Clint Eastwood, George Clooney, Prince, Taylor Swift, Sean Penn, Bruce Springsteen, Helen Mirren, Morgan Freeman, James Franco, Kanye West, Leonardo DiCaprio, killed by Kang and Kodos and made them into body parts for the Treehouse of Horror XXV title.
• John Travolta, blasted on the head by Kang and Kodos
• Jimbo Jones, Decapitated by Beelze-Bart.
• Homer Simpson, body sliced and beheaded by Beelze-Bart, however he is still alive at the time
• Sideshow Mel, beaten to death by Homer
• Moe Szyslack (possibly), beaten to death
• Marge Simpson, killed herself while washing the oven
• Homer Simpson, killed by the Ghost of Tracey Ullman Show version of Homer by hitting him on the head with a toaster
• Lisa Simpson, jumped out of the window and fell to her death and she turned into the ghost.
• Bart Simpson, suffocated by Lisa (as the ghost) with her Bart's slingshot and he turns into the ghost
• Maggie Simpson (possibly), killed by Groundskeeper Willie, although he was carrying Maggie's carcass along with Bart's and Lisa's dead bodies and she turns into the ghost.
• Gerald, killed by Maggie (as the ghost) and he turns into the ghost.
• Marvin Monroe, unknown.
• Snowball II (aka Snowball V)(possibly), it's unknown if she was killed by the ghosts
• Santa's Little Helper (possibly), it's unknown if he was killed by the ghosts

Treehouse of Horror XXVI

• Nelson Muntz, Milhouse, Ralph Wiggum, Jessica Lovejoy, all hanged to death.
• Homer Simpson, his soul got eaten by a ghost monster Frank Grimes.
• Bart Simpson, killed multiple times by Sideshow Bob.
• Sideshow Bob, beheaded by Homer Simpson, but was later revived as a disconfigured chicken and his head remained.
• Professor Frink, squashed to death by Homerzilla.
• Moe Szyslak, roasted and burned to death by Homerzilla.
• Kearney, killed by Milhouse after dumping him into the volcano.

Treehouse of Horror XXVII

• Sideshow Bob, Leprechaun, Kang or Kodos and Frank Grimes' ghost, all decapitated by Maggie.
• Couch, knocked out by Homer with a stone.
• Tortoises, killed by Apu so he can sell their water.
• Ralph Wiggum, exploded before the Hunger Games-esque contest started.
• Peta and Peeta, killed by Homish.
• Gerald Samson, killed by a shotgun's recoil.
• Wendell Borton, killed by Nelson.
• Ned Flanders, probably killed by Barney, as his head is in the front of the Plow King.
• Nelson Muntz, shot in the back by Milhouse.
• Mr. Burns, probably killed by either the Springfieldians of the flood.
• Springfield residents, probably died during the snow storm.
• Janey Powell, killed with a lawnmower by Rachel.
• Sherri and Terri Mackleberry, killed by Rachel via a falling tombstone during Janey's funeral.
• Dr. Mancuso-Gluckman, killed by Rachel with a "It gets better" painting.
• Deer and Buddha, ran over by Lisa on her dark imagination.
• Milhouse Van Houten, asphyxiated to death with a plastic bag by Rachel.
• Snowball V, accidentally killed by Rachel as he jumped in front of a knife thrown at Marge.
• Sargent Sausage, microwaved by Rachel and later eaten by Homer.
• Rachel, killed by Lisa, when Lisa imagines Rachel as her mom married to a dentist, and fading in the process.
• Dolph, Jimbo and Kearney, killed by Moe.
• Dewey Largo, Gary Chalmers, Selma Bouvier, Disco Stu, Nelson Muntz, Mrs. Muntz, Sideshow Mel, Rainer Wolfcastle and other members of the mob, killed by Moe, Bart, Groundskeeper Willie, Gil Gunderson and Barney Gumble.
• Moe, Groundskeeper Willie, Gil Gunderson and Barney Gumble, killed by the angry mob.
• Homer Simpson, killed by Bart.

Treehouse of Horror XXVIII

• Chocolate Rabbit, eaten by the Simpson family.
• Helen Lovejoy, impaled by Maggie(as Pazuzu)
• Julius Hibbert, stabbed in the neck by Maggie(as Pazuzu)
• Ned Flanders, chocked/suffocated to death by a toy police car.
• Pazuzu(possibly), suffocated by Bart (Note: Bart was controlling him instead.)
• Other Bart Simpson, accidentally strangled to death by Homer.
• Other Homer Simpson, impaled by a pair of scissors, but still alive.
• Homer Simpson, cannibalized himself for food.
• Barney Gumble, Comic Book Guy, a horse, possibly cannibalized for food. (Note: They were mentioned by Carl as Lenny said he can get so much meat out of Homer, presuming they were eaten by Homer)

Citations

• The Simpsons Archive 'Characters on the Show' deaths The Simpsons Archive
• The Simpsons Archive 'THOH' deaths The Simpsons Archive