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In this image released by the Pima County Sheriff's department, police vehicles are seen in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. At far left a sign showing Giffords event can be seen. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, officers are seen speaking to people in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, medical gloves and other debris are seen near a lunch table outside of a Safeway grocery store, in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, medical supplies, markers, other debris and what appears to be blood, are seen in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

FILE - This Jan. 8, 2011 file photo provided by the Pima County Sheriff's Office shows Jared Loughner, who carried out the shooting rampage in Tucson that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others. Authorities are set to release more than 300 photos on Tuesday May 21, 2013, that investigators took in the aftermath of the Tucson shooting rampage . (AP Photo/Pima County Sheriff's Department via The Arizona Republic, File) ( Congresswoman Shot-Photos )

In this image released by the Pima County Sheriff's department, police notes are seen scrawled on the trunk of a police car, in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, a Smith & Wesson knife is seen in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, a Glock 9mm gun with an extended magazine is seen in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, a Glock 9 mm pistol is seen in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, weapons including guns and knives are seen in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, police notes, including naming Jared Loughner as a suspect and detailing weapons found at the scene, are seen scrawled on the trunk of a police vehicle during the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, police notes detailing the status of victims, are seen in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, officials, left, and triage debris, lower right, are seen in the aftermath of the Tucson shooting rampage that killed six people and wounded former U.S. Rep. Gabrielle Giffords and 12 others in January 2011. At far left a sign showing Giffords event can be seen. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )

In this image released by the Pima County Sheriff's department, a car with a bumper sticker supporting U.S. Rep. Gabrielle Giffords is seen in the aftermath of the Tucson shooting rampage that killed six people and wounded the former U.S. representative and 12 others in January 2011. Authorities released more than 300 photos on Tuesday, May 21, 2013, made by investigators during their investigation in the parking lot of the shopping center where the shooting took place. (AP Photo/Pima County Sheriff) ( Congresswoman Shot Photos )