Learn more about Aaron Alexis, the gunman killed by police in Monday's Navy Yard shooting.
Alexis, who was from New York City, served as a full-time Navy reservist between 2007 and 2011, but was honorably discharged after a "pattern of misconduct," a U.S. defense official with knowledge of the investigation told CNN on condition of anonymity.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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