Anybody mention Felix Pappalardi, bass player of Mountain? Some great tunes on those first two albums. I remember seeing his obit in 1981-82 or so.
G.G. Allin ODed- or, one could say, died of being G.G. Allin.
Marc Bolan (T. Rex) - smashed his car into a tree.
Chris Oliva, guitar player of Savatage died as a result of a car crash. He had given up drugs and alcohol, and had his life headed in the right direction.
After having taken his wife to dinner, his car was hit by a drunk driver. Chris died, and his wife was paralyzed.
One of the greatest rock guitarists ever.
John Entwistle of the Who…apparent heart attack.
Clawman, Bolan has been mentioned several times. Starting with the OP.
Gram Parsons (country-rocker, “discovered” Emmylou Harris)–OD’d on alcohol and morphine