RedactedNarrative: The owner/operator of the vessel and three passengers were operating on Bighorn Reservoir. The operator was operating the vessel at a high rate of speed when it collided with a cliff face. Evidence from the scene indicates that the operator attempted to turn away from the cliff face, however the vessel impacted the cliff striking the starboard side of the vessel and keel. 
  
  The vessel broke into pieces and sank. The three passengers were all killed in the impact or subsequent immersion in the reservoir. The operator was conscious when contacted by responders and transported to the hospital. The operator entered a medically induced coma in the hospital and later died of related injuries on Sept 8th. 
  
  Preliminary investigation suggests alcohol may be a factor in the accident. Further testing is being conducted and conclusive results will be available later.