BAGHDAD, Iraq (CNN) -- The U.S. soldier who authorities say killed five fellow troops -- including a Navy commander -- at a stress clinic in Iraq on Monday apparently used a weapon he wrested away from another soldier, a Defense official said. The Camp Liberty shooter has been identified as Army Sgt. John M. Russell of Sherman, Texas. After getting the weapon, the soldier stole a military vehicle and drove to the clinic, where earlier he had been in a fight, the official said. The shooter was identified as Army Sgt. John M. Russell, according to Maj. Gen. David Perkins, the military spokesman who briefed reporters in Baghdad, Iraq, on Tuesday.
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NEW: Suspect struggled with fellow soldier over weapon, defense official says
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Army Sgt. John Russell charged in killings of five fellow soldiers
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Russell, 44, of Texas serving third tour in Iraq
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Military spokesman: Russell referred to counseling, had gun confiscated recently
His father, Wilburn Russell, also of @placeholder, said Russell had e-mailed his wife saying he believed unidentified officers were trying to run him out of the military.