ampahunter,
sorry to hear about your friend.

It is true that alot of heart attacks happen while hunting. If you think about all the work that we do hiking to our stands climbing into the tree and then we sit there for hours not moving and then the BIG BOY walks through and nervousness hits along with the adrenalyn rush thats alot of work being put on the heart. I killed my first deer this year and after I shot I had to sit down and get control of myself before I could climb down, even then it took an hour before I was breathing normal.