RedactedNarrative: 	ICO indicated to me that based on information that he learned from the coroner's office, a male and female were found nude and deceased on the boat.  Preliminary indications were that the couple had been possibly exposed to Carbon Monoxide of a toxic level. 
  	I also learned that Fire Department officials the night before had taken air readings from inside the boat that far exceeded the toxicity threshold. It was described to me that the boat had to be ventilated for approximately 30 minutes before the air reached a safe level for first responders and coroner's office personnel to enter the boat. 
  	He indicated that both of the deceased were found nude, nearly on top of each other, on the floor near the foot of the bed.  No engines were reported as running when they were discovered.
  	During an exterior inspection, I observed that the Line 1 shore power supply cord was defective (see photographs). The threaded retainer ring was missing from the supply cord at the boat receptacle. With the ring missing, the plug could easily be disengaged but still appear to be plugged in.  Owner said that he had already purchased another supply cord this year, but had not yet replaced it because the boating season was coming to a close. 
  	Owner showed us the one and only Carbon Monoxide detector on the boat. It was located in the berthing area on a wall outside of the bedroom door. He told us that it was hardwired into the boat's power supply system and to his belief, was fully functional. He stated that he knew this because he personally had installed it and had also manufactured the mounting plate that it was affixed to. With the line 1 shore power supply cord fully engaged, a green light was illuminated on the CO detector. 
  	Owner allowed us to conduct trials with the boat's shore power system.  We discovered that when the line 1 shore power cord was unplugged completely and also slightly disengaged, the air conditioner unit would not function.  He indicated that Victim1 would not know to check this shore power supply cord to see that it was plugged in completely.
  	Additionally, when the line 1 shore power supply cord was disengaged, the green light on the CO detector would turn off possibly indicating that it was not functional.
  	Owner further stated that when the boat is secured in his slip, he cannot let the inboard engines idle for very long without Carbon Monoxide building up inside of the cabin. He stated that he normally closes the door to the berthing area to prevent the CO detector from tripping into alarm mode. Owner theorized aloud that Victim1 may have run the inboard engines while in the slip for awhile and then turned them off, causing a CO buildup inside of the boat. 
  	Owner indicated that the boat's generator was operational.  Upon request, he started the generator.  The gasoline generator's engine seemed to run and function well. The exhaust port for the generator was located on the starboard hull, forward of the stern and above the water line.
  	Before leaving, I told Owner that I thought it would be appropriate for him to contact his boat insurance company and advise of the deaths that had occurred on his boat. He dialed a phone number and appeared to leave a message for someone. 
  
  	After discussing with Det., learning from Owner, inspecting the boat and its equipment, it was my belief that if Carbon Monoxide poisoning was in fact the cause of death for the two individuals, I believe that the Carbon Monoxide could likely be sourced to one of the three gasoline engines on the boat. I also believe that due to the outside temperature in the Portage area on Friday, September 15th, (High 87, Mean 73, low 60 degrees Fahrenheit), anyone spending any significant amount of time in the berthing area would likely be extremely uncomfortable without functional air conditioning. It is possible that at some point, one or more engines were started and ran in attempt to get the air conditioner to function.
  Wednesday, September 20, 2017
  	On this date, I received a phone call from ICO Brock.  He advised me that he had learned on this date that Owner's boat had been taken to Doyne's Marine for winterization services.  A Doyne's representative indicated that he had discovered the presence of a significant leak in the generator's exhaust manifold. 
  Thursday, September 21, 2017
  	After learning from ICO of the exhaust manifold leak on the generator, I began to conduct some online research on fuel combustion engines and air/fuel mixture. See attached documents.
  	I discovered that when the air supply to engine becomes overly rich in Carbon Monoxide and lacks Oxygen, the engine will "choke" and stop running. 
  It is possible that:
   - If the line 1 shore power supply cord was not engaged completely the air conditioner would not function
   - The generator was started and had been running inside the engine compartment
  