Mullins and the others had been on a fishing trip and were headed back to Buncombe Creek Cove, the patrol said.
The southern Oklahoma lake was very rough because of strong winds in the area and the boat began taking in water.
A large wave hit the vessel, causing it to capsize, throwing all five people into the water about 100 yards from shore, troopers said.
About 10 feet out, Mullins collapsed in three feet of water and went under, the patrol said.
Other occupants pulled him ashore and administered CPR before he was transported to Integris Marshall County Medical Center, where he was pronounced dead at 2:30 p.m.
The other occupants, including 15-year-old Jesse M. Mullins, of Saloman, Kan., weren’t injured, the patrol said. It wasn’t immediately clear whether the teen and Mullins were related.