A U.S. Army court-martial has found a soldier guilty of murder in the execution-style slayings of four bound and blindfolded Iraqi detainees in the spring of 2007, Associated Press reported. Sgt. 1st Class Joseph Mayo, 27, pleaded guilty Monday to charges of premeditated murder and conspiracy to commit premeditated murder at his court-martial at the U.S. Army's Rose Barracks. A charge of obstruction of justice was dropped by prosecutors. Mayo, of Fort Bragg, North Carolina, faces the possibility of life in prison and will be sentenced later Monday. The incident occurred while Mayo was deployed to Iraq.