Hart County Coroner Jeff Roten reported that the victim, James Key, 53, had recently moved to Kentucky from Texas to stay with his sister, who lives in Elizabethtown.
Roten said Key, his sister, and a brother-in-law were camping at Dog Creek.
Key and his brother-in-law reportedly took a boat out onto the lake and as they were making their way back to the camp, the driver of the boat lost control of it and Key was ejected. Key's brother-in-law, who was driving the boat, was not identified by Roten.
Key was reportedly not wearing a life jacket.
Roten said that the brother-in-law attempted to throw a life preserver to Key, but was not successful.
Key went under the water and never came back up.
According to Roten, the Hart County Rescue Squad found Key in about 20-30 feet of water near the Dog Creek campgrounds.
The Kentucky Department of Fish and Wildlife public affairs office reported that the body was recovered around 7:15 p.m. local time.
According to Grayson County E-911 dispatchers, divers from the Leitchfield, Clarkson, Anneta and Wax Fire Departments were paged out just after 7 p.m., but the call was canceled 20 minutes later after Hart County rescuers found Key.
Key's body was sent to Louisville for an autopsy, Roten said, with results reportedly consistent with drowning.