If I may:
Yes. I think his old lady either killed him herself, or had him killed.
As to the music: Nirvana wouldn't be anything without the Melvins. Have a listen sometime, it's like any riff of any worth that Nirvana ever used was first created by the Melvins, who IMO were THE superior band from Seattle, with Soundgarden a distant second. Pearl Jam is trash.