Grammy-winning singer, songwriter, and composer Isaac Hayes died in Memphis on Sunday. He was 65.

The music legend was found unresponsive near a treadmill at his home, investigators say. He was pronounced dead an hour later at Memphis’ Baptist East Hospital.

Hayes won a Grammy for the “Theme From Shaft,” but was well-known to younger fans as “Chef” on the popular Comedy Central series, South Park.

He had also filmed a cameo role in “Soul Men,” a film due out later this year alongside Bernie Mac, who also passed away over the weekend.

He is survived by his fourth wife, 12 children, and 14 grandchildren.