i think someone blew his head off. i've tried putting a shotgun in my mouth and pulling the trigger with my foot sober to see if it's possible and granted it's doable, i don't see it happening on as much dope as he was on.
RIP kurt, its quite possible he was murdered but I think he did himself in, the guy was pretty depressed. Wish he was still around today though i love me some nirvana, have ever since like 6th grade.