The Sequoyah County Sheriff's Office brought in a Texas group Friday to help in the search of Lake Tenkiller for the body of Matthew Fagan.
Friday, Texas EquuSearch and Recovery used sonar equipment to sweep parts of the lake. The team is a non-profit organization that helps search for bodies in water all over the country.
Fagan was reported missing in June by three friends he hiked Buzzard Roost Trail with at Cato Creek.
The three friends, Tyler Leverett, Blake Shamblin, and Michael Snelling were arrested last week. All three have been charged with first-degree murder.
The search for Fagan's body in the lake near the trail is still underway.