RedactedNarrative: Vessel 1 (V1) was traveling south, approximately 3/4 miles offshore, with two adults and one minor child onboard.  Occupant 1 and Occupant 2 (Minor) were below the deck sleeping.  Occupant 1 woke up and did not see the operator/victim at the helm or upon the vessel.  Occupant 1 notified United States Coast Guard (USCG) via VHF channel 16 of a "Man Overboard" incident.  USCG, Palm Beach Sheriff Office (PBSO) and FWC, initiated a search by air and water for the operator/victim.  The operator/victim was located in the water offshore of John D. MacArthur State Park and transported, unresponsive.  The operator/victim was pronounced deceased by Riviera Beach Fire Rescue at Riviera Beach Marina.  The Palm Beach Medical Examiner determined the cause of death to be drowning, while the manner of death, accidental.  Victim was wearing a gray T-Shirt and Blue shorts.  He had a medical history containing seizure disorder.  He had a minor abrasion on the bridge of his nose, left elbow and left ankle. He was in full rigor mortis at the time he was discovered floating face down, 3/4 miles offshore of MacArthur Beach State Park.  An attempt was made to revive him with CPR, however it was unsuccessful.