Have you seen Soaked in Bleach? There's no way anyone could watch that and not think something dodgy went on. I guess we'll never know.
I simply consider the fact that he talked about suicide a lot and was clearly in a dark place when he left that rehab center and flew back to Seattle. Plus no one had a motive and Courtney wasn't in Seattle when he died. But like you say, definitive answers may remain elusive,

