RedactedNarrative: Father and two sons were frog hunting in Tensas River.  Operator was the operator of the vessel and stopped the boat to urinate.  He was standing on the port stern deck and fell overboard.  Son advised Operator had been drinking alcohol.  Son jumped in to attempt to save him but was unsuccessful.  There were two type III pfd's and one type IV on board which were not used.  the vessel used was MI5637 BS. The investigation is complete.