Who is Aaron Alexis?

Published On: Sep 17 2013 10:15:55 AM CDT

Learn more about Aaron Alexis, the gunman killed by police in Monday's Navy Yard shooting.

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Kristi Suthamtewakul

But while one friend in Texas admitted Alexis was "frustrated with life," he never showed signs of violence, Nutpisit Suthamtewakul told CNN.

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