RedactedNarrative: On 08/13/2020 at approximately 1810 hours I Game Warden received a call from Park Ranger stating there had been a boat collision on Fall River Lake in Greenwood County Kansas.  
  
  I notified Subject I would be in-route from my residence.  At approximately 1845 hours I arrived on scene to an area on the shoreline near the Fall River State Park cabins.  When I arrived on scene EMS and fire crews were performing CPR on an adult male later identified as Victim1.  Also, on shore with this individual was his son Victim1’s son and his two brothers.  
  
  When I spoke to Brother2, he told me that him and his brother Brother1 were at the cabin and their brother Victim1 and his son Victim1’s son were riding jet skis.  
  
  They were going to come by the cabins to wave at them.  He saw them coming but could not see them when the collision occurred.  I then spoke to Victim1’s son who was on the phone with his mother at the time.  I asked him to explain to me what happened.  He stated that they were both going full throttle and his dad started to do circles in front of him and he hit him.  I asked him where he hit him, and he showed me that the impact was on the side of the vessel.  I asked if his vessel stopped or went over the other vessel.  He stated that he went over the vessel.
  
  At this time Victim1 was loaded onto a private vessel with medical staff and transported to the boat ramp where the ambulance was waiting.  I transported Brother2 to an area in the state park where the life flight helicopter was waiting for the patient.  EMS received the patient on shore at 1917 hours.  At 1931 hours Victim1 was pronounced deceased.  Notifications were made to the family members and information was gathered.  At this time, I recovered and photographed both vessels.  They were then loaded on the trailer and additional photographs were taken.  I took the vessels into my custody for further investigation and they were stored in the State Park compound at Fall River Reservoir.  
  
  Based on the damage patterns we determined that vessel one which was being operated by Victim1 was struck by vessel two being operated by Victim1’s son.  The impact was at 80 degrees and vessel two rode over vessel one and exited off the back-left side of vessel one.  Photographs were taken of both vessels along with the measurements.  We determined the vessels could be returned to the family.
  
  On 08/19/2020 I received preliminary autopsy results from Under Sheriff.  The preliminary results stated that the cause of death was blunt force trauma.  On 9/15/2020 I received final autopsy results from Under Sheriff.  The final results also stated that blunt force trauma was the cause of death.  The autopsy reported fractured left ribs and fractured and displaced right ribs.  The right lung had scattered contusions and both lungs contained liquid and clotted blood.  Both lobes of the liver had deep lacerations.  The autopsy also reported numerous abrasions on the right side of the body.