In December, the body of 51 year old Russell Shawver was found in the shallow waters of Lake Buffalo.
Wichita County Sheriff David Duke says he had been on a fishing trip and never returned home.
Although a preliminary autopsy report in January stated no water was then found in his lungs, Sheriff Duke says the final and complete report rules Shawver's death as an accidental drowning.
It had been speculated that because of his medical history he might of have had a heart attack but the autopsy did not list any heart condition contributing to death.
Copyright 2016 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.