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Aaron Alexis,34, is the contractor the FBI has identified as a suspect in the mass shooting at the Washington Navy Yard on Sept. 16, 2013.

Aaron Alexis,34, is the contractor the FBI has identified as a suspect in the mass shooting at the Washington Navy Yard on Sept. 16, 2013.

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Who is Navy Yard Gunman Aaron Alexis?

The picture emerging of the dead gunman in Monday's rampage at the Washington Navy Yard is a study in contrasts, one of a man who practiced languages and meditated, and another of a cold-blooded killer.