Among the victims: 9-year-old Christina-Taylor Green and Giffords' Aide Gabe Zimmerman

The Pima County Sheriff's Office released the names of the victims who were killed in the shooting rampage:

The Sheriff confirmed 5 were pronounced deceased at the scene and a 9 year old was later pronounced at the hospital. The deceased have been identified as: John Roll (63), Dorothy Morris (76), Dorwin Stoddard (76), Christina Greene (9), Phyllis Schneck (79) and Gabriel Zimmerman (30).

John Roll was the Federal Judge.

Christina Taylor-Green, the 9-year-old:

Aspiring politician Christina-Taylor Green was born in the midst of tragedy on Sept. 11, 2001, and died Saturday morning while trying to meet Congresswoman Gabrielle Giffords.

The strong-willed 9-year-old third-grader had gone to meet Giffords with a neighbor when she was shot. She died later at University Medical Center.

Her neighbor was shot four times and was recovering from surgery Saturday evening.

Christina-Taylor had just been elected to the student council at Mesa Verde Elementary School and had been interested in politics from a young age, her father, John Green, said Saturday night.

"She was a good speaker. I could have easily seen her as a politician," her father said.

Gabe Zimmerman, the Congressionial aide:

Gabe Zimmerman organized the event in Tucson on Saturday where he was shot to death.

As Rep. Gabrielle Giffords' community outreach director, Zimmerman was a key organizer for all the "Congresswoman on the Corner" events over the years that were aimed at bringing his boss closer to constituents. This work was a natural fit, said friends and fellow politicos, who described Zimmerman as a tireless organizer and gentle man uniquely gifted at working with average folk.

"He was at Gabrielle's side at these 'Congresswoman on the Corner' events," recalled a longtime colleague, Tom Zoellner, an author and a volunteer in Giffords' campaigns. "He would take down their names and their information, and he would pledge to get to work on it. This stuff matters. The 'Congresswoman on the Corner' thing was Gabrielle's idea, but it was Gabe's bailiwick."

Zimmerman, 30 and a Tucson native, worked for Giffords since her first congressional campaign in 2006. He started as a field organizer, became constituent services director when Giffords took office and later took on outreach duties. That job put him in charge of logistics for all of Giffords' public district events. He helped constituents with day-to-day details such as Social Security checks.