Isaac Lee Hayes Jr. (August 20, 1942 - August 10, 2008) was the voice of Chef from 1997 until he left South Park because of the controversy surrounding the "Trapped in the Closet" episode in 2005. It is most likely that he left because of the episode's potrayal of Scientology and the fact that he was a Scientologist himself.

Well before leaving, Hayes made an appearance as himself in the mockumentary, Chef Aid: Behind the Menu, in which he did not know who Chef was.

He passed away aged at 66 due to complications of a stroke and was commemorated by South Park Studios.

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