RedactedNarrative: Victim was in the area of the rear of the cabin and Subject1 was towards the middle of the cabin just behind the operator's station. Operator, the vessel operator, engaged the one engine and began to move forward out into the lake while the other two occupants were still on the narrow decking (walkway). Subject1 and Victim were attempting to come back to the rear deck area at that time. The area Victim was at was the transition point to where the fiber glass deck and the wood decking began, also, a small block of wood is located at that transition point. Victim fell off the boat at this time. It is believed that he may have slipped on the wood decking, this decking would have been very slippery if it was wet and Victim had no shoes on. The wood decking is very slick with many coats of clear coat paint. Subject1 observed Victim fall in and began to pound on the cabin window to notify Operator. Operator saw Victim twice come up from the water for a brief second. Operator immediately turned the vessel to the starboard side (right). Subject1 threw a white pillow out into the water for Victim but she could not see him anymore. Operator advised it took 45 seconds for the boat to make a turn with only one engine and that Subject1 went to the other side of the boat to look for Victim and he could not be seen. Subject1 called 911 for help at this time and they searched for Victim while help was en-route. After first responders arrived Subject1 and Operator remained out on the lake searching until dark then returned to Marina Shores in Portage Indiana. Alcohol may have been a factor in the fall overboard, but cannot be determined until after toxicology results are known.