The United States Attorney’s Office for the Eastern District of Oklahoma announced that Austin Dean Mc-Mahan, age 24, of Okmulgee, was sentenced to 600 months in prison on each of two counts of Second Degree Murder in Indian Country. The terms will be served concurrently.

The charges arose from investigations by the Federal Bureau of Investigation, the Okmulgee Police Department, and the Okmulgee County Sheriff ’s Office.

On February 16, 2023, McMahan pleaded guilty to an Information of two counts of Murder in Indian Country-Second Degree. According to investigators, on April 7, 2020, McMahan killed two people at an Okmulgee residence. Mc-Mahan shot and killed the first victim during an argument. He then fired on a second vic- tim who had attempted to come to the first victim’s aid. After the gun jammed, McMahan procured another firearm and shot the second victim multiple times. The crimes occurred in Okmulgee County, within the boundaries of the Muscogee Nation Reservation, in the Eastern District of Oklahoma.

The Honorable Ada E. Brown, U.S. District Judge in the United States District Court for the Northern District of Texas, sitting by assignment, presided over the hearing in Muskogee. McMahan will remain in custody of the U.S. Marshal pending transportation to a designated United States Bureau of Prisons facility to serve a non-paroleable sentence of incarceration.

U.S. Department of Justice Organized Crime and Gang Section Trial Attorney Cesar Rivera-Giraud and Assistant United States Attorney Ryan Bondura represented the United States at sentencing.