This is always an interesting topic dont know if its been done before but I strongly believe that he killed himself. He had tried to with pills about a month before, and he was genuinly depressed. He aimed his musics at the outcasts in society, and in the end the bullies and the so called "cool" kiRAB started listening to it, and he hated that. Sure, Courtney Love has serious problems, but I wouldn't say she murdered Kurt.