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This video image provided by the Office of Rep. Gabrielle Giffords shows Giffords and her husband, Mark Kelly, walking. Giffords announced Sunday, Jan. 22, 2012 she intends to resign from Congress this week to concentrate on recovering from wounds suffered in an assassination attempt a little more than a year ago. (AP Photo/Office of Gabrielle Giffords)

Gabrielle Giffords

Authorities released hundreds of pages of documents on March 27 that provide new insight into how the 2011 Arizona shooting occurred and the motivations behind gunman Jared Loughner. Six people were killed in the attack and several people, including then-Rep. Gabrielle Giffords were seriously injured. (AP)