According to Roger Friedman of FoxNews.com, Chef Isaac Hayes did not voluntarily leave his cartoon gig on South Park because of the now infamous Scientology episode. Cue mysterious music. Isaac Hayes did not quit South Park. My sources say that someone quit it for him. I can tell you that Hayes is in no position to have quit anything. Contrary to news reports, the great writer, singer and musician suffered a stroke on Jan. 17. At the time it was said that he was hospitalized and suffering from exhaustion.