This is a sad story, but it’s worth noting a few things:

- Apparently everyone was wearing a life jacket
- The only survivor found so far was sitting ON TOP of the overturned hull. Water temps are in the high 60s, life expectancy in the water is something around 18 hours.
- No radio messages or calls for help were heard, which implies it happened quickly
- They were anchored 50 miles offshore in 15’ seas.
- From what I can tell, they had no EPIRB.

My guess would be that they were anchored to go fishing, or had engine problems and dropped the anchor while they worked on it. Building seas, plus having the anchor down (probably with not enough scope) probably allowed a wave to roll over the bow, swamping the boat, and causing it to flip. With the boat flipped, there was no radio; with no EPIRB, there was no way to call for help. They hung on for as long as they could, eventually became hypothermic, and let go. The lone survivor probably was the only guy able to get on top of the hull rocking in the waves…