RedactedNarrative: Operator of vessel #1 was pulling victim on a tube.  It is unclear what exactly happened since we have no details about the accident.  Vessel #1 was pulling a tuber and somehow struck vessel #2 and vessel #3; and the tuber became deceased from a head injury.  No other injuries were reported. Based on numerous witness statements, the operator appeared to be operation extremely close to shore and the associated docks. Witnesses also described the operator as jerking the boat to the left. At this time, the tubers appeared to swing to the right and colliekd with a docked vessel. 