Of the six people killed during Saturday's rampage in Arizona, UC Santa Cruz graduate Gabriel Zimmerman, 30, was among them. Zimmerman was Gabrielle Giffords' community outreach director. He had organized the "Congress on Your Corner" event Saturday in Tucson.

Zimmerman, a Tucson native and social work advocate, earned a sociology degree and graduated with honors in 2002. He was affiliated with Stevenson College during his time at UCSC.

"On behalf of the entire UC Santa Cruz community, my wife Kelly and I extend our heartfelt condolences to Gabriel Zimmerman's family, friends and colleagues," UCSC Chancellor George Blumenthal said in a written statement. "Gabe's work on behalf of the people of Arizona's 8th congressional district reflected his passionate commitment to the value of public service."

Mentally ill gunman Jared Lee Loughner was charged Sunday in the shooting of 20 people, which claimed the lives of six people.