Friends and family of those killed at a Navy Yard shooting look on during a memorial for those killed during a shooting at the Navy Yard, at the Marine Barracks in Washington D.C., Sept. 22, 2013. 12 people were killed Sept. 18, 2013.

- Image ID: DEY2M6
Friends and family of those killed at a Navy Yard shooting look on during a memorial for those killed during a shooting at the Navy Yard, at the Marine Barracks in Washington D.C., Sept. 22, 2013. 12 people were killed Sept. 18, 2013.
MixPix / Alamy Stock Photo
Image ID: DEY2M6
Friends and family of those killed at a Navy Yard shooting look on during a memorial for those killed during a shooting at the Navy Yard, at the Marine Barracks in Washington D.C., Sept. 22, 2013. 12 people were killed Sept. 18, 2013.