Has the court of GetBig issued a final judgement on the
mortis causa yet?
I'm going to stake my colors to the mast here and go with massive heart attack.
I think the insulin thing - although it can kill - is a red herring. I'm about the height Mr McC was (6' 1") and the idea of just walking around at approaching 24 stones (UK) blows my mind - let alone pushing the sort of weights he was using!

. There may even have been a genetic propensity towards cardiomyopathy, who knows?
The description someone else left in this thread about the presentation of someone if you found them after such an episode, and how it could be confused with "chocking" was the clincher for me.
Unfamiliar with US law as I am, others have commented that the actual cause will be published, correct? So anyone else care to cast judgement, as somebody has to be right?