Giffords, along with her husband, astronaut Mark Kelly, spoke to anchor Diane Sawyer for the interview, which ABC News previewed via a picture on Twitter.
Giffords suffered a gunshot wound to the head on Jan. 8, 2011, while speaking to constituents at an Arizona grocery store. After having to undergo intense rehabilitation therapy for her injuries, she resigned from Congress the following January. Giffords and Kelly did their first sit-down interview after the shooting with Sawyer in November 2011 timed to the release of Kelly's memoir, Gabby: A Story of Courage and Hope.
ABC World News with Diane Sawyer airs weeknights at 6:30/5:30c.