TWO MEN GO HUNTING TOGETHER, DIE OF HEART ATTACKS
Two elderly men who had gone turkey hunting together died of apparent heart
attacks just minutes apart, authorities said.
Ref. https://www.cnn.com/2005/US/04/27/hunter.deaths.ap/index.html
I'm not sure what the mystery is here. Two elderly people go hunting- one of which has a history of heart problems- and they both have heart attacks. Likely, after one of them had the heart attack the stress of seeing his friend fall is what brought on the other heart attack.
-Unferth