RedactedNarrative: Vessel was anchored from the bow when Subject1 fell in the stern of the boat.  His additional weight in the stern caused the vessel to become unstable.  It swamped and then capsized.  Both subjects were ejected from the boat into the water without life jackets.   Subject2 was able to retrieve a life jacket and put it on.  Subject1 was able to retrieve a life jacket but could not put it on.  Subject1 could not swim and had a heart condition.  He disappeared under the water and was not seen again