The two prisoners escaped from the Muskogee County jail -- about 60 miles southeast of Tulsa -- around 10:30 p.m. Sunday by breaking through a four-level security window and going onto a roof, Administrator Jeremy Garvin of the Muskogee County Sheriff's Office told ABC News.
"Once they reached that roof, they jumped," Garvin said.
One of the men, Raymond Noriega, was injured from the jump, Garvin added, and the other prisoner, Paul Newberry, helped him to a nearby vacant vehicle.
They tried to steal the vehicle, but failed, Garvin said, so Noriega stayed inside the vehicle while Newberry fled.
Noriega, who suffered injuries to both of his heels from the jump, was taken into custody and is at the hospital today, Garvin said.
Newberry, meanwhile, remains on the run, Garvin said.
Newberry, 24, was charged with first-degree murder in the July 2015 shooting death of prominent Cherokee County rancher Charley Kirk, said Jackson Thorp, an Oklahoma First Assistant District Attorney.
Newberry’s whereabouts are unknown, Thorp told ABC News today. The case was scheduled before his escape for District Court arraignment Dec. 17.
U.S. Marshals and the Muskogee County Sheriff's Office are investigating, Garvin said.
An officer with the Muskogee Police Department told ABC News its officers are keeping an eye out and checking abandoned buildings.