RedactedNarrative: At approximately 6:18 PM on July 11, 2020, I (CPO) was dispatched to a suspected fatal boat accident on the Illinois River in Grafton. I arrived on scene at approximately 7:00 PM. On arrival, I spoke to Grafton Police Officer, who was first on scene. Officer provided me with information obtained from each occupant on the watercraft involved. He was confident in his determination the operator was not impaired. However, the victim may have taken prescription medication including Vicodin. I additionally made contact with Missouri State Trooper. Trooper had arrived on scene shortly after the incident and documented the approximate location of the incident by speaking with witness.
  
  I conducted interviews with all occupants involved in the incident. Each occupant on the watercraft denied consuming drugs or alcohol on the day. Additionally, I observed no indicators of drug or alcohol impairment on the operator or any other occupants. I discovered at approximately 5:57 PM, six individuals were on a pontoon boat rented from Grafton Harbor. 
  
  They were operating downstream on the Illinois River near mile marker 1 in Grafton (Jersey County). The occupants were preparing to end their day by docking the rental boat at Grafton Harbor. Traveling at a slow speed (estimated at less than 10 MPH), with no hazardous water conditions, Subject1, who was positioned in the starboard side behind the operator''s seat, suddenly went overboard. None of the other occupants witnessed whether Subject1 fell or jumped in. Subject2 and Subject3 claimed Subject1 had been acting “goofy”.  Subject4 could only attest the entry into the water was “amiss” and “a sloppy dive”. 
  
  Shorty after going overboard, Subject1 appeared distressed and began calling for help. Subject2 brought the watercraft to a stop momentarily before turning and operating towards Subject1 to assist him. Subject4 threw a personal flotation device into the water but out of Subject1''s reach. Subject4 then jumped into the water and was able to get to Subject1. 
  
  However, during the rescue attempt, Subject1 was combative in his attempt to stay above water. As the boat approached Subject1 and Subject4, Subject1 began to go limp. The occupants of a separate boat stopped to assist. They were able to get Subject1 and Subject4 into the boat, but Subject1 was unresponsive. 
  
  They immediately called 911 and began CPR. Unable to revive him, they relocated to Grafton Marina. Other civilians assisted in attempting to revive him before the Jersey County Ambulance arrived on scene. Subject1 was ultimately determined to be deceased by the Jersey County Coroner. 
  
  All other occupants were unsure whether Subject1 had drowned, had a heart attack or another medical issue causing his death. Subject3, Subject1''s wife, claimed he regularly takes prescription medication. She described Subject1 as a strong swimmer. Whether he jumped in or fell overboard not immediately undetermined. 
  
  Grafton Harbor owner provided me with a copy of records for the rental agreement. See attached documents. I discovered subject5 was listed as the actual renter. The other occupants were listed as "Drivers/Passengers". A Rental Boat Safety Certificate of Completion issued to Subject5 was included with the rental agreement. Upon questioning Subject2 on his boating experience and education, he described participating in the course provided by Grafton Harbor. He described taking the course and test along with subject5. However, he did not receive a certificate himself as a result of subject5 meeting the rental requirement.
  
  I inspected the watercraft and discovered the safety equipment was in compliance. No violations were discovered during the investigation. The cause of death is pending an autopsy. See attac...
  