RedactedNarrative: Vessel one passengers stated that they were out for a cruise on the boat and the operator asked if there was water coming from the bilge pump hose and they stated no. Operator started to head back to shore and then the bow of the boat raised up, and the stern went under water and the boat sank backwards into the water, leaving all occupants in the water. The operator was not able to swim well and went beneath the water.  Another vessel saw what happened and came to the rescue, recovering the occupants from the water. Operator was unresponsive and had been under water for approx. 5 minutes. Operator was transported by air evac to grady memorial hospital in chickasha. Operator died at ou medical center in okc, on the following day after the accident. Vessel one was recovered by the ohp dive team on 09-01-2015.  A possible source of the bilge water was around a leaking bilge plug.  Area of the accident was approx 200 yards west of the main boat ramp.
   