The Krusty Burglar or rather, his actor, was majorly injured by Homer Simpson (while acting as Krusty the Clown) when he believed him to actually be stealing the burgers during a promotion of the new Krusty Burger (the one with Ketchup), thus resulting in the kids (and the announcer) being left mortified. One of the kid's cries of "stop, sto-oo-op, he's already de-eaa-aad!" indicates that Homer's beatdown killed him, but this is false, as the Krusty Burglar spoke after the kid pleaded Homer to stop. Given his accent, he is presumably of Estonian origin.
Actor for children's shows, a parody of McDonald's Hamburglar. He probably had to retire after he was brutally damaged by Homer Simpson when Homer thought he was really stealing all the burgers