Learn more about Aaron Alexis, the gunman killed by police in Monday's Navy Yard shooting.
But while one friend in Texas admitted Alexis was "frustrated with life," he never showed signs of violence, Nutpisit Suthamtewakul told CNN.
Staff Sgt. Marc Ayalin/U.S. Marine Corps
Kevin Winter/Getty Images
Brace Hemmelgarn-USA TODAY Sports/Reuters
Montgomery County Sheriff Office
Gary W. Green/POOL
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