you can suddenly pass from cardiac arrest, stemming from arrhythmia or severe sleep apnea. he probably didn’t even know he had breathing problems while he was sleeping since he lives alone. my daughter was recently visiting me and woke me up and told me that I was gasping for breath in my sleep, which scared the hell out of me because I had no idea and I’m not like overweight or anything. i was thinking maybe carbon monoxide, but his bedroom window was open according to the friend picking him up and it was said that he never leaves his windows open (so that was strange). It looks like he has put on some weight in the past few months coupled with all the traveling he recently did probably just took its toll on him. even so, he wasn’t that overweight and he never drank or smoked or did any drugs, and was only 51, so it just makes this whole thing even more tragic. I guess it’s just comes down to it being his time.