I have two similar stories.
1. A guy had a heart attack (I think that was it) while out boating while the throttle was wide open. He rammed another boat side on, his bow went over the side and hit the other boater. Neither survived.
2. Last winter, during one of the big snow storms, a local marina or boat shop owner was out plowing snow around town. He worked for ~24 hours straight, pushing himself way too hard. He passed out, and had a seizure while driving. The truck went onto a golf course and right into a tree. Luckily, he survived, but the little s*** in the office who took a video and posted to facebook calling him a drunk had to make a public apology and was fired.