A few others you may not have known are Jim Morrison, from The Doors, who died from heart failure; (although no autopsy was performed) Kurt Cobain, from Nirvana, who died by shooting himself with a shotgun; Brian Jones, Rolling Stones founder, and guitarist, who died by drowning in a swimming pool.
The first musician recorded to the "27 club" was one of the greatest blues players of all time, Robert Johnson, a very influential bluesman, (you can here the style and technics ALOT in Keith Richards and Eric Claptons music) who died from strychnine poisoning.
Here are 5 samples from each of the following.