Molloy

Molloy is a cat burglar who lived at the Springfield's Retirement Castle. He started a crime wave in Springfield, that ended with the world's largest being stolen, which led to his arrest. He mentioned having been a cat burglar for years. He tricked the entire town into going on a phony treasure hunt, and he escaped from prison during it.

Stolen items

 * Bart's portable TV and stamp collection
 * Lisa's saxophone
 * Marge's necklace
 * Flanders's Shroud of Turin beach towels
 * Skinner's Stormin' Norman commemorative plates (which had been previously stolen)
 * Selma's lock of MacGyver's hair
 * The world's largest cubic zirconia

Simpsons Comics
He appeared again where he was as one of the suspects when the zirconia was stolen again.