Six people died and 13 people were injured, including Giffords, who is still recuperating.

CNN: Intern's memoir recalls Giffords shooting

Loughner, 22, is accused of killing six people, including a judge, and wounding a total of 13, including Giffords.

CNN: Giffords arrives in Houston

The push for a change began after the Tucson attack, in which six people were killed and 13 wounded, including Ms. Giffords, and Arizona Democrat.

WSJ: Odd Couples Form in Seating for State of the Union Address

Mr. Dupnik, who turns 75 years old on Tuesday, was catapulted to the national stage on Saturday when a gunman opened fire outside a local supermarket, killing six and wounding 14 others, including Rep. Gabrielle Giffords.

WSJ: Arizona Elicits Sheriff's Criticism

The January 8, 2011, attack killed six people and wounded 13 others, including then-U.S. Rep. Gabrielle Giffords.

CNN: Attorneys for Loughner expected to enter new plea Tuesday