If you haven't seen it, his movie "What Dreams May Come" from 1998 has many connections to him dying today. Maybe that was too strong, but it is a good watch about him dying and saving his wife from hell.
Hi Mason, if one is familiar with his comedy routines, it is obvious that he was always drawing from the demons in his own life that haunted him through his career at least in the early days. Williams was someone that always made me laugh. Sometimes that was just at nothing but at times would bring one to have to laugh at ourselves. Regardless what the investigation reveals that led to his suicide, the saddest thing of all is the demons that haunted him whether it be depression or whatever, won the battle. I know I personally will miss him.