The shotgun....
You said he couldn't pull the trigger cause he had to many heroin,but I also read somewhere that the shotgun was to long and that it was impossible to pull the trigger himself,unless he did it with his toe but they foud him with HIS SHOES ON...
It's still a mystery but i don't think he killed himself...
someone must've gave him heroin and when he was weak that S*CKER SHOT HIM!
Who could kill a legend like him?