A U.S. soldier convicted of rape and murder two decades ago will be executed December 10 in the nation's first military execution since 1961, the Army said Thursday.

Pvt. Ronald Gray has been on the military's death row at Fort Leavenworth, Kansas, since 1988. A court-martial panel sitting at Fort Bragg, North Carolina, unanimously convicted him of committing two murders and other crimes in the Fayetteville, North Carolina, area, and sentenced him to death.

Gray's execution by injection will be carried out by Fort Leavenworth soldiers at the Federal Correctional Complex in Terre Haute, Indiana, the Army said in a news release.