Have you seen a copy of Kurt's suicide letter? It's just a bunch of random musings in his handwriting that don't hint at suicide at all, then 3 final lines tagged on the end in different handwriting basically saying "Ok gonna kill myself now Frances well be better off keep going without me Courtney." Then he proceeded to do enough heroin to OD (because that's what was found in his body), then he neatly packed up his heroin kit and put it away, while having enough heroin in his body to be unconscious and dying, then blew his own head off.