Apparently there is a question of whether or not this is actually a reportable boating accident per IDNR Sgt.  He has been attempting to contact the USCG since the accident for verification of information. 
According to the operator, he and his passenger were involved in a regatta on Lake Michigan, when, while making a maneuver, the victim was hit in the head by the boom and knocked overboard.  Due to the injury sustained, the victim cannot recall any of the events that happened that day.
Chicago                       