RedactedNarrative: A witness at a residence on the lake reported seeing a boat running without an operator and a person "flailing" in the water. The witness attempted to rescue the victim but could not get to him before he submerged. The victim's body was recovered the afternoon of the accident.  Upon inspection of v1, the operator's seat was found on the floor of v1 dislodged/removed from it's normal position within v1. V1 was found to have no other defects and was in working order. It is unknown at this time what caused the victim to fall overboard.