Eric Cartman is one of the two co-protagonists (alongside Kyle Broflovski) of the television show South Park.
He was seen when Bart and Milhouse were watching his show. During the episode an O. J. Simpson riot broke out at Eric's school. His severed head was shown on the show, thus he is presumably dead.
Nelson once dressed as him, while waiting at a bus stop.
During the song "High to Be Loathed", Mr. Burns mentions Eric Cartman, and makes his shadow, among lots of other villains.