South Park is the greatest show ever created.
Is that the show where a character dies at the end every time?
Well the show revolves around Cartman, Stan, Kyle and of course the one you're thinking of...  Kenny!
I can't say I've ever watched it, but it is supposed to be adult humor, right?
You could certainly say that.  Adult animation is any type of animation work that mainly targets adults.
I used to watch The Simpsons.  They had a lot of adult humor, and political humor.  I haven't watched it in a long time, but I think it still has large following.
The Simpsons
The Simpsons is an American animated sitcom created by Matt Groening for the Fox Broadcasting Company. The series is a satirical depiction of working-class life, epitomized by the Simpson family, which consists of Homer, Marge, Bart, Lisa, and Maggie. The show is set in the fictional town of Springfield and parodies American culture and society, television, and the human condition.
The family was conceived by Groening shortly before a solicitation for a series of animated shorts with producer James L. Brooks. Groening
South Park
South Park is an American adult animated sitcom created by Trey Parker and Matt Stone and developed by Brian Graden for the Comedy Central television network. The show revolves around four boys—Stan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormick—and their exploits in and around the titular Colorado town. Much like "The Simpsons", "South Park" uses a very large ensemble cast of recurring characters. It became infamous for its profanity and dark, surreal humor that satirizes a wide range of topics