RedactedNarrative: On 09/11/2021 at approximately 11:20 PM, I, Conservation Police Officer, was made aware of a boat accident by CPD Marine Unit. They advised me a passenger, had fallen off of a watercraft on Lake Michigan near Hyde Park. CPD Marine Unit and USCG were conducting a search for the person in the water. I was provided contact information for a witness, and the discription of the watercraft. The boat was 50'' and white,  I contacted Sgt. and made him aware of the incident. It was unknown if the passenger fell over board in Indiana or Illinois waters.  
  
  I contacted passenger/witness, she advised me of the following:
  She advised me a passenger on board fell off and they could not locate him and called for help. The USCG were out searching and they told them to put life jackets on and head back to Hammond Marina. She advised me there were approximately 15 people on board and the boat was not rented. She asked me if I wanted to talk to the operator because I was trying to confirm the marina they were headed back to, she advised he looked focused. As I was talking to her she hung-up  and I was not able to get in contact with her again but left voicemails for her to call me back. 
  
  At approximately 11:50 PM, I contacted Indiana Conservation Police Dispatch to make them aware of the accident and advised them watercraft headed back to the Hammond, IN Marina. I arrived at Hammond Marina at approximately 12:00 AM. I was contacted by Indiana CPO, he advised me he was on his way to the Marina to assist. I was let in by security and taken to the end of "S" Dock were the vessel was located. CPD Marine Unit "M3" was on scene gathering information. I identified the Operator/Owner, and gathered passenger information. I was advised caller left and was not answering her phone. CPO arrived approximately 10 minutes later to assist. 
  
  Indiana CPO arrived and assisted, He had the operator, provide a breath sample on Preliminary Breathe Test, Results: .000.
  
  After speaking with the operator and passengers, I was advised "vessel" left Hammond Marina at approximately 9:30 PM and was traveling north on Lake Michigan at 7-9 MPH, approximately 2 miles from shore near 63rd St. Victim was at the bow of "vessel" and had to use the bathroom inside the cabin of the boat. He stood up and walked to the starboard side along the gunwale passing the operator but never made it to the rear of the boat. A female yelled to operator that someone had fallen over board. Operator throttled down spun the boat around, turned on his search lights and began going south. Operator contacted the USCG on the marine radio and called 911. They continued looking until the USCG arrived and instructed them to stop searching and not interup their search. "vessel" returned to Hammond Marina with CPD Marine Unit.  Victim was observed to be drinking alcohol but it is unknown what his intoxication level was.  
  
  On 09/12/2021 at 1:35 am, Operator provided me with a written statement. I advised him I will be contacting him in the morning
  
  09/12/2021, I called Operator for addtional information, he did not answer, a voicmail was left. I contacted the USCG - Station Chicago, they advised me the GPS coordinates of last point seen. I was advised USCG - Chicago were notified of USCG - Michigan City at 10:43 PM of the person in the water. 
  
  09/13/2021, I called caller, she did not answer, a voicemail was left. I contacted Operator via phone and spoke to him regarding the Boat Accident Report form he will be required to fill out. I also advised him to forward me all the paperwork for the "Legacy".
  
  I contacted USCG Sector and requested their GPS search pattern that was conducted.