All speculation, but with this much interest (Google Mark Haines Cause of Death) it will come out soon. To me it seems very unlikely that some unremarkable sort of sudden death like MI or stroke was found. Every rock star, movie actor, TV small or large presence the cause of death eventually comes out, and it will in Mark's case too.
Has it been mentioned that he got a post? If not, why not, since an apparently health man died at home without any call to 911 or trip to the hospital?
Was he alone? Was his wife or some other person present? Does he have a housekeeper?
As far as does it matter, what is modern media saturated life other than guiltfree voyeurism?
Ha