An autopsy determined 28-year-old Kameron Brown of Ohio drowned, Effingham County Coroner Kim Rhodes said.
On October 8th, Brown and another person were working at a construction site on the lake when they decided to swim across to their Airbnb, Rhodes said.
The 73 degree water temperature caused his body to cramp, restricting oxygen levels to his organs and causing him to drown, Browns said.
Authorities say divers recovered Brown's body from the lake's center basin, which has a depth of around 34 feet.