Court documents show a Sequoyah County man was killed with a hammer and his body thrown into Lake Tenkiller last month.
The sheriff's office says the body of Matthew Fagan has not been found after he was reported missing during a hike with friends last month.
Last week, a dive team tried to find his body.
7/13/2016 Related Story: Dive Teams Search For Body Of Missing Hiker Near Lake Tenkiller
Those friends, Tyler Leverett, Blake Shamblin, and Michael Snelling were arrested last week. All three have been charged with first-degree murder.
All three remain at the Sequoyah County Jail, where they are being held without bond.