I don't think it was accidental. I think he intentionally hung himself. He had a long history of depression and substance abuse, much of which is all coming to light now.
Attendees at the Detroit show are posting that he seemed "off" and was mumbling incoherently into the microphone from time to time.
That was my first thought, having known a few departed that had addictions. They realized that they had relapsed and felt that there were no more options. And its sad, they are always killing the wrong person.
Anxiety drug he was prescribed might have given him paranoid and suicide thoughts. His wife says she talked to him after show and he was slurring his words and said he took too many. Seems sad overdose that brought this on. He seemed to have everything to live for and was making Memorial Day plans with family.