let's begin the discussion with larry king who joins us by phone tonight, bonnie fuller and our chief medical correspondent dr. s sanj sanjaygupta. what would you questions be? >> clearly, this is young to have a heart attack even when you look at, you know, any preexisting health conditions. average age of someone having a first heart attack if this is what we're talking about is usually in the mid 60s. john as you suggest it's important here, there is very limited information that we know and so i think the medical personnel, the people figuring this out on the ground there will want to know are there any other potential risk factors here? if this was, in fact, heart disease, heart attacks typically cause something known as a cart yak arrest. the heart attack itself is caused because there is not enough blood flow to the heart but what can cause death is the heart as a result of that goes into abnormal rhythms but other things can cause abnormal rhythms as well. did he have a prekprisiexisting condition he didn't know about? was there medications? was there a stroke involved? could