RedactedNarrative: Operator and victim had been fishing for several hours on a private lake.  Victim fell inside the boat causing it to overturn and both fell into the water.  They both swim to shore since they 20 - 30 feet out.  Victim had just reached shallow water to walk onto shore when he grabbed his chest and fell forward into the water.  Victim was known to have a medical history of Parkinson's disease, strokes, clotting disorder, and deep brain stimulation implants.  It is thought that the victim died from a medical disorder resulting from the physical activity of swimming to shore.