Witnesses state they observed subject fishing and at about 1050 hours they noticed his boat appeared to be a drift.  At approx. 1150 hours, witnesses decided to check on the welfare of subject.  They found that the vessel was empty and began searching for subject.  They found him floating face down in the water.  Since subject's 's body did not sink, the M.E. stated he appeared to have a heart attack.
Durant                        