Before his Kenny-esque death, Chef joined the Super Adventure Club (not Scientolgy, of course) who brainwashed him, turning him into a child molester. Subtle. During his eulogy the show made it clear their anger was not directed at Chef/Hayes:
"A lot of us don't agree with the choices the Chef has made in the last few days. Some of us feel hurt and confused that he seemed to turn his back on us. But we can't let the events of the past few weeks take away the memories of how Chef made us smile.We shouldn't be mad at Chef for leaving us. We should be mad at that fruity little club for scrambling his brains."