Don't know if the actor John Cazale has been mentioned. Starred in some classic films of the 70s first two Godfathers, The Conversation, Dog Day Afternoon and I believe died before the release of his last film The Deer Hunter.
The only actor to have every film he appeared in nominated for a Best Picture Oscar. A sad loss, who knows what he might have achieved.
Another guitar great who went too soon - Jeff Healey