It's been confirmed as suicide. Supposedly he hung himself in the bathroom. Saddest bit is on the last song of the night he sang a verse from Zeppelin's In My Time Of Dying
'In my time of dying, I want nobody to mourn.
All I want for you to do is take my body home.
Well, well, well, so I can die easy.'
Man, that just breaks my heart a little bit more.
Down with this sort of thing.