RedactedNarrative: Vessel operator reports that she and the victim (Victim) were riding a SeaDoo jet ski in the small lake behind the house.  Neither Operator nor Victim were wearing a personal flotation device. They both were thrown from the jet ski out in the middle of the lake.  Operator was able to swim, however Victim was having difficulty.  He had told everyone that he couldn't swim and was advised to wear a life jacket, but he refused to.  Operator swam over to help Victim but could not hold him up and herself at the same time.  She told Victim that she was going to swim back to the jet ski and bring it back to get him. He told her he would be alright.  When she got back to the jet ski she looked back and could no longer see Victim.  She reports that she searched for 15 minutes for him but he never surfaced.  She then hurried back to the dock where she alerted subject to call 911.  Operator remained onshore while subject took the jet ski out to continue searching for Victim.  Dive team searched for Victim until 1:30 am but couldn't find him due to no visibility from thick weeds and muck.  They resumed their search at 7:00 am the next morning.  At approximately 1:30 pm the victim was located underwater by two deputies who were drifting in a Zodiac boat supporting the divers. Victim was transported to the Wayne County Medical Examiners office.  No others were injured.