My theory is that he was a victim of a black widow who he took up to his room. The family doesn’t want anyone to know he was unfaithful.
Something out of the ordinary and fatal happened. If he had injuries to his head comparable to a couple of whacks with a baseball bat, a simple fall is not believable. Since he predicted his death a couple of months before, it is probable that he was living on the edge with some far out associates.