AN AMERICAN SOLDIER COMES HOME FROM IRAQ, THEN DISAPPEARS: WHAT DO HIS BROTHERS-IN-ARMS KNOW? -- "48 HOURS MYSTERY," SATURDAY, MAY 20

Twenty-five-year-old Army Specialist Richard Davis survived the war in Iraq, only to vanish the day after he returned to the U.S. The Army listed Davis as absent without leave -- or AWOL -- but his father refused to believe it. Correspondent Erin Moriarty has been following this story for more than two years and speaks to Davis' parents and his fellow soldiers for 48 HOURS MYSTERY: "Duty, Death, Dishonor" to be broadcast Saturday, May 20 (10:00-11:00 PM, ET/PT) on the CBS Television Network.

Davis was destined to join the military. His mother, Remy, was an Army medic and his father, Lanny, was a military policeman for 20 years. Richard began his career in the Army as a peacekeeper in Bosnia. He was later assigned to the 3rd Infantry Division and based at Fort Benning, Ga. Davis' unit was among the first to invade Iraq in March 2003, and they saw some of the fiercest combat of any American troops. Davis survived his tour of duty in Iraq and returned to the U.S. on July 13, 2003. After celebrating his homecoming with his Army buddies in Columbus, Ga., he disappeared. 48 HOURS follows Lanny Davis' emotional search to find out what happened to his son.

The night Davis disappeared he was with four fellow soldiers: Jacob Burgoyne, Alberto Martinez, Mario Navarette and Douglas Woodcoff. When Davis failed to show up at the base the next day, the Army listed him as AWOL. But, Davis' father refused to believe it. He tells Moriarty, "I think everyone's lying and I'll tell them that straight to their face. Everyone is lying." When Lanny Davis began investigating his son's disappearance, he discovered everything his son owned was left in his room, proving his theory, he says, that his son had not deserted the Army.

Two months after Davis' disappearance -- with strong encouragement from his father -- the Army finally opened an official investigation. What did the Army discover? Just what did Davis' fellow soldiers know about his abrupt disappearance? Were there secrets from the war in Iraq that they were trying to hide?

The broadcast also examines the impact of war on the combatants, including some battle scars that may not be easy to detect.

48 HOURS MYSTERY: "Duty, Death, Dishonor" was produced by Paul Ryan and Daria Hirsch. Anthony Batson is the senior producer and Susan Zirinsky is the executive producer.