This accident was entered by the Coast Guard because it occured on a private body of water.  According to news media reports, a victim fell overboard when fishing on a private pond.  His body was recovered.  The article indicates that the cause of death was "likely medically-related". http://www.ketv.com/Man-Says-Brother-Died-At-Favorite-Fishing-Spot/-/9675214/11669344/-/eih1kv/-/index.html