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Tillman joined the Army after the Sept. 11, 2001, terror attacks even though he had a multimillion-dollar contract to play football for the Arizona Cardinals. He and his brother completed a tour in Iraq before going to Afghanistan

Tillman, 27, died on April 22, 2004, when he was struck by gunfire during a firefight along a canyon road near the Pakistan-Afghanistan border. The Army said at the time that the barrage of bullets came from enemy fire.

Tillman's mother, Mary, told the Washington Post Saturday that the criminal investigation should have been launched at the onset. "The military has had every opportunity to do the right thing and they haven't," she said. "They knew all along that something was seriously wrong and they just wanted to cover it up."

A report by the Army later found that troops with Tillman knew at the time that friendly fire had killed the football star. Officers destroyed critical evidence and concealed the truth from Tillman's brother, also an Army Ranger, who was nearby, the report found.