RedactedNarrative: On June 2, 2017 at approximately 1:26 PM, I received information of a possible drowning involving a person who had jumped off a boat into the water and had not resurfaced at Lake Springfield. Springfield Fire was requesting a DNR officer to assist with sonar search. At approximately 2:45 PM I arrived to the cove immediately to the west of Lincoln Memorial Garden and Nature Center at Lake Springfield with side scan sonar. When I arrived several other agencies were already on scene searching for the victim and interviewing witnesses. The primary investigating agency up until this point was Springfield Police Department. Divers from SFD and ESDA were also on scene and in the water. CWLP Lake patrol and Springfield PD Lake Patrol were also there assisting in the search. 
  
  I first spoke with Springfield Fire Department to get updated information of what exactly happened and where the witnesses were located. Springfield Firefighters told Intern and I the victim jumped or fell off the boat into the water. SFD said all boat occupants were taken from the scene to an unknown location. I received conflicting reports from SPD about the location to where the victim entered the water. I called ISP Communications to have SPD bring all witnesses back to the scene. 
  
  Intern and I first interviewed Subject1 stated a total of 4 occupants were onboard at the time Victim entered the water including Victim. The other three witnesses were swimming in the water. Subject1 stated at approximately 12:50 PM Victim was bent over to pick something up approximately midship on the port side when Victim jumped/fell out of the port side door/gate. 
  
  Subject1 stated he was the renter/operator of the boat but no one was operating the vessel at the time Victim entered the water. Subject1 stated the boat was drifting in the cove at the time Victim entered the water. We took Subject1 out on the boat and marked 4 different points. The weighted average between the 4 points Subject1 gave was approximately near the location of GPS coordinate of 39.697182, -89.600397. Subject1 stated he called 911 approximately 2 minutes after Victim entered the water and did not resurface. This is where we began our side scan sonar search. 
  
  At approximately 4:02 PM Intern and I then interviewed subject2 who was according to SPD, was the most sober and alert of the occupants. We picked Subject2 and the Springfield Fire Chief up from the shore and them out to what he believed to be the last known location of Victim. 
  
  Subject2 stated somewhere between 1-1:15 PM (911 call was at 1:08 PM) the victim fell out of the boat into the water from the platform up near the bow of the boat. Subject2 did not see Victim fall in the water but heard the splash (Subject1 witnessed the jump/fall from the vessel). Subject2 said Victim was the most intoxicated of all the occupants. Subject2 otherwise corroborated much of the same story as Subject1. Subject2 stated after Victim entered the water he attempted two dives to find Victim. Victim stated by the second dive, Subject1 had already called 911. 
  
  Subject2 stated after the second dive he exited the water back into the boat and spoke to first responders. Subject2 stated he was operating the boat prior to stopping the boat in the cove to swim. We made a couple passes near where Subject2 believe the boat to be at the time Victim entered the water and marked it with a buoy. The approximately average weighted GPS location between the two waypoints was located at 39.697811, -89.600534. Subject2 provided us with a written statement of his account of the event. 
  
  We then escorted Subject2 and the Springfield Fire Chief back to shore. I received information of our trained Sonar Operator had arrived to the CWLP…