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Suspected Navy Yard shooter Aaron Alexis: A veteran with anger issues (VIDEO)

Police records show suspected Navy Yard gunman Aaron Alexis was discharged from the military in 2011 and had at least two other violent run-ins with authorities in Texas and Washington state.

Aaron alexis naval yard shootingn 2013 09 16Enlarge
Aaron Alexis (FBI/Courtesy)

A picture began to emerge Monday night of Aaron Alexis, the troubled former sailor suspected of gunning down a dozen people at the US Navy Yard in Washington DC.

Born in New York, the 34-year-old Alexis was discharged from the Navy Reserves in 2011 following one of several shooting incidents.

No one was injured in either confrontation in Seattle, Washington, or Fort Worth, Texas, police say.

But they both appeared to stem from seemingly minor incidents — construction workers using parking spaces in his Seattle neighborhood and a woman in his Fort Worth apartment complex who made too much noise.

His father told police in Seattle his son had "anger-management issues," blaming his son's traumatic experiences attempting to rescue victims at the scene of one of the 9/11 terrorist attacks, according to the Washington Post.

"Those events disturbed him," officers said in the police report filed following the Seattle incident.

What caused Alexis to go on Monday's deadly shooting spree in the nation's capital remained a mystery to FBI and Navy officials.

Alexis, who was about to start work at the Navy Yard as a civilian IT contractor, was shot dead in a gunbattle with DC police after shooting at least 12 people dead and wounding eight more.

According to Reuters, he had "secret" clearance to the DC site through a military-issued ID card.

Navy officials described a pattern of misconduct that led to his discharge after four years of service in the Navy Reserves.

But acquaintances painted a completely different picture, describing him in interviews as a quiet, practicing Buddhist who spoke Thai, traveled widely for work and was taking an online course in aeronautics.

Many said there was "no way" he would carry out such an attack.

"He's not aggressive," Nutpisit Suthamtewakul, a friend and owner of Happy Bowl Thai in White Settlement, Texas, told ABC News. "He had a gun but that doesn't mean he's gonna shoot people. He had a concealed-weapons permit."