Ex-Navy Man Aaron Alexis Is Suspected Navy Yard Shooter

FBI believes Alexis killed 12 civilians at a Washington navy yard before police killed him.
2:53 | 09/17/13

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Transcript for Ex-Navy Man Aaron Alexis Is Suspected Navy Yard Shooter
new details about the alleged shooter, aaron alexis. The 34-year-old was a navy reservist. And then, an i.T. Contractor for the navy. Pierre thomas there in washington has much more on him. Good morning, pierre. Reporter: Good morning, robin. New information continues to flow in overnight. Sources tell us the suspect recently bought a shotgun used in the attack in a north virginia gun store. And they're questioning whether he got two other weapons at the scene. Right now, there's no evidence of terrorism. And the fbi believes he acted alone. This is the man, aaron alexis, that the fbi suspects of committing mass murder. Alexis, 34, is a former navy man in the military from may 2007, to january 2011. Much of it served at a naval station in ft. Worth, texas. Alexis, seen here in candid, photographs, worked as a contractor. He had security clearance that gave him access to work on sensitive computer systems at the navy yard. Alexis had access to the navy yard. Reporter: Police searched his rental card found at the navy yard. And went to a nearby residence inn where he had been staying. And went to ask shocked friends and associates. Police say he murdered people at random, shooting whoever was in front of him, until he was shot and killed in a confrontation with police. There's no question. He would have kept shooting. Reporter: A look at the suspect's past shows gun play. In 2010, alexis was arrested by ft. Worth police, for shooting a gun into the ceiling of his apartment. And according to a 2004 seattle police report, alexis shot the tires of a construction worker's car, in an anger-fueled rage. His son has helped rescue people on 9/11. As a result, suffered from posttraumatic stress disorder. He talked about it he went to the v.A. And they would give him some medicine. Reporter: Friends in texas where he lived, say he became a practicing buddhist. In recent years, he befriended the owner of this thai restaurant. He helped out a lot and became popular with the customers here. Reporter: Two of his friends told abc news, in his free hours he would spend military-style video games. Some friends reported that alex was frustrated about his pay as a consultant, and difficulties finding full-time work. There was frustration there. He didn't feel as a vet, why he was getti iting treated like this. Reporter: The fbi is trying to find out if the suspect got psychological treatment. And the fbi is asking anyone with information to contact them at 100-800-call-fbi. George?

This transcript has been automatically generated and may not be 100% accurate.

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