Yeah, so many. Same with the early rock'n'rollers. It's amazing how good they got in the few years available to them. I've just discovered Booker Little (died 23) who played with the better known Eric Dolphy (died 36) and John Coltrane (who made it to the grand old age of 40). None of their deaths were the result of the usual suspect, drug abuse, although perhaps life on the road took its toll in other ways. Segregation and the US medical system won't have helped.