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Aaron Alexis, responsible for the September 16, 2013 shootings at the Washington Navy Yard in Washington, D.C., is shown in this undated handout photograph (Credit: Reuters/Kristi Suthamtewakul)

Aaron Alexis, responsible for the September 16, 2013 shootings at the Washington Navy Yard in Washington, D.C., is shown in this undated handout photograph (Credit: Reuters/Kristi Suthamtewakul)