RedactedNarrative: I, Game Warden was patrolling Lake Mead National Recreation area on May26th, 2018, National Park Service dispatch informed units on the water of a potential boat accident victim located in the Swallow Bay area.  At approximately 1719 I responded to the scene. Upon my arrival two coast guard officers were performing CPR on victim. We quickly transferred Victim to National Park Service vessel 61 for advanced emergency medical support. I remained on scene to question witnesses as to the incident. 
  
  On Scene were two personally owned Jet Ski''s as well as one rental boat. There were 10 individuals in the party. 
  
  According to subject, the individuals were packing up the rental vessel to return to Las Vegas Boat Harbor at approximately 1445. The Vessel was rented by Victim, and he was going to operate the vessel with one Jet Ski in tow, Subject was to drive the other Jet Ski back to Hemmenway Harbor. 
  
  Victim mounted one ski to see if it would operate properly as there were some mechanical issues with it. Victim was unable to start the ski and began to drift into open water. Subject mounted the second ski to help his brother. In the process of trying to manipulate the ski, Victim fell off of the ski and into the water. Subject tried to assist but he also fell off of the ski he was on. The ski with mechanical issues started to swamp and began to float vertically in the water. Subject was able to mount his ski and get back to shore. Victim began to struggle with the ski, unable to right it or mount it. 
  
  It became apparent that Victim was in distress to the party on the beach with the rental boat. Subject2 operated the vessel but was not comfortable operating the boat, he was able to get to Victim and they pulled him on the swim deck. Victim still exhibiting visible signs of distress, they held him on the swim deck, eventually getting him in the vessel to a seat. After a couple of minutes, Victim displayed signs of cardiac arrest. 911 were called. 
  
  Victim had two prior episodes of cardiac arrest and also had an internal defibrillator installed in his chest.
  