RedactedNarrative: VESSEL 1 WAS STATIONARY IN A PRIVATE POND WITH THREE OCCUPANTS. OPERATOR 1 STOOD UP TO URINATE,  WHICH CAUSED VESSEL 1 TO ROLL OVER. OPERATOR 2 AND WITNESS 1 WERE ABLE TO SWIM BACK TO SHORE, OPERATOR 1 WAS NOT.  WITNESS 1 LEFT THE SCENE IN ATTEMPT TO FIND HELP, WHILE OPERATOR 2 REMAINED ON SHORE.  WITNESS 1 WAS TRANSPORTED TO THE HOSPITAL AND NEVER RETURNED. OPERATOR 2 WAS LOCATED ON SHORE THE FOLLOWING DAY, DECEASED. OPERATOR 1 WAS ALSO LOCATED THE FOLLOWING DAY UNDER THE WATER, DECEASED. OPERATOR 1'S CAUSE OF DEATH WAS DROWNING SECONDARY TO HYPOTHERMIA.  OPERATOR 2'S CAUSE OF DEATH WAS HYPOTHERMIA EXPOSURE.  NO PERSONAL FLOATATION DEVICES WERE ONBOARD OR AVAILABLE.  DRUGS AND ALCOHOL ARE BOTH CONSIDERED FACTORS IN THE INVESTIGATION.