Miss Veronica Crabtree, aka "Muffin" by those truck drivers who knew her closest. She was the boys' feisty bus driver who was always down to lend a kind word of advice like "Sit down and SHUT UP!" Ms. Crabtree had a brief stint as a stand-up comedienne, making it all the way onto the Tonight Show. But met an unfortunate fate at the hands of the Left Hand Killer and was murdered in "Cartman's Incredible Gift" (813).
Season 1: Cartman's Mom Is a Dirty Slut
Before Dr. Mephisto can reveal who Cartman's Dad is, he is shot.