I just heard too. Wow, I am really surprised. So sorry to hear it. They say massive heart attack. Don't remember his dad's age when he died but he was in his 80s I think.
RIP
TIS
"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK