In this Jan. 5, 2011 file photo, House Speaker John Boehner reenacts the swearing in of Rep. Gabrielle Giffords, D-Ariz., on Capitol Hill in Washington. Authorities say that Giffords was shot in the head on Saturday, Jan. 8, 2011 while meeting with constituents in her district in the area around Tucson. (Susan Walsh / Associated Press)
In this April 3, 2006 file photo, Arizona Federal District Judge John McCarthy Roll appears before the Senate Judiciary Committee on Capitol Hill to discuss immigration litigation reduction. Roll was fatally shot Saturday, Jan. 8, 2011 in the attack on Rep. Gabrielle Giffords of Arizona. (Dennis Cook / Associated Press)
This March 2010 photo shows a man identified as Jared L. Loughner at the 2010 Tucson Festival of Books in Tucson, Ariz. The Arizona Daily Star, a festival sponsor, confirmed from their records that the subject's address matches one under investigation by police after a shooting in Tucson that left U.S. Rep. Gabrielle Giffords wounded and at least five others dead. Police say a suspect is in custody, and he was identified by people familiar with the investigation as Jared Loughner, 22, of Tucson. (Mamta Popat / Associated Press)
Emergency personnel work at the scene where Rep. Gabrielle Giffords, D-Ariz., and others were shot outside a Safeway grocery store in Tucson, Ariz. on Saturday, Jan. 8, 2011. (Matt York / Associated Press)
Emergency personnel use a stretcher to carry a shooting victim to a helicopter outside a shopping center in Tucson, Ariz. on Saturday, Jan. 8, 2011 where U.S. Rep. Gabrielle Giffords, D-Ariz., and others were shot as the congresswoman was meeting with constituents. (KGUN9-TV / Associated Press)
Emergency personnel use a stretcher to carry a shooting victim to a helicopter outside a shopping center in Tucson, Ariz. on Saturday, Jan. 8, 2011 where U.S. Rep. Gabrielle Giffords, D-Ariz., and others were shot as the congresswoman was meeting with constituents. (KGUN9-TV / Associated Press)
Emergency personnel stand near the scene of a shooting involving Rep. Gabrielle Giffords, D-Ariz., on Jan. 8, 2011 in Tucson, Ariz. (Arizona Daily Star, Kelley Presnell / Associated Press)
Police search the parking lot outside a Safeway where there has been a shooting involving Rep. Gabrielle Giffords, D-Ariz., on Saturday, Jan. 8, 2011 in Tucson, Ariz. (Arizona Daily Star, Kelley Presnell / Associated Press)
People gather at the scene of a shooting involving Rep. Gabrielle Giffords, D-Ariz., on Jan. 8, 2011 in Tucson, Ariz. (Arizona Daily Star, Dean Knuth / Associated Press)
A man sits near the scene of a shooting that involved Rep. Gabrielle Giffords, D-Ariz., on Saturday, Jan. 8, 2011 in Tucson, Ariz. (Arizona Daily Star, Kelley Presnell / Associated Press)
Law enforcement officials walk outside the listed address of a Jared L. Loughner Saturday, Jan. 8, 2011 in Tucson, Ariz. U.S. Rep. Gabrielle Giffords of Arizona was shot in the head Saturday when an assailant opened fire outside a grocery store during a meeting with constituents, killing at least five people and wounding several others in a rampage that rattled the nation. Police say the shooter was in custody, and was identified by people familiar with the investigation as Jared Loughner, 22. Pima County Sheriff's officials said he used a pistol to carry out the shooting spree. U.S. officials who provided his name to the AP spoke on condition of anonymity because they were not authorized to release it publicly. (Matt York / Associated Press)
Flags fly at half-mast outside University Medical Center where Congresswoman Gabrielle Giffords was sent after being shot Saturday, Jan. 8, 2011, at a Safeway grocery store in Tucson, Ariz. (Chris Morrison / Associated Press)
People gather at the office of U.S. Rep. Gabrielle Giffords, D-Ariz. in Tucson, Ariz. on Saturday Jan. 8, 2011 after she and others were shot at a shopping center. (Nick Oza / Associated Press)
Rep. Gabrielle Giffords of Arizona was shot in the head Saturday when an assailant opened fire outside a grocery store during a meeting with constituents, killing at least five people and wounding several others in a rampage that rattled the nation.
TUCSON, Arizona (AP) — U.S. Rep. Gabrielle Giffords of Arizona was shot in the head Saturday when an assailant opened fire outside a grocery store during a meeting with constituents, killing at six people and wounding several others in a rampage that rattled the nation.