RedactedNarrative: TWELVE INDIVIDUALS WERE BEING TOWED ON A BANANA BOAT WITH ONE OPERATOR AND ONE OBSERVER.  VICTIM FELL OFF BANANA BOAT AT AN UNKNOWN TIME.  AN ADDITIONAL 2, 3, OR 4 RIDERS FELL OFF.  OPERATOR CIRCLED BACK AND DID NOT SEE VICTIM.  VICTIM WAS STRUCK BY VESSEL/PROPELLER AND SUSTAINED FATAL INJURIES.  A REPORT WILL BE COMPLETED AND SUBMITTED TO HILLSDALE COUNTY PROSECUTOR.