Tucson, AZ (KGUN/CNN) - Voters in Arizona's 8th Congressional District decide Tuesday who will fill former representative Gabrielle Giffords' seat.

It's a special election between her former aide Ron Barber and Republican Jesse Kelly, who she beat in 2010.

Giffords accompanied her husband Mark Kelly and Barber to cast her ballot Tuesday.

Barber was shot in the same attack outside a Tucson grocery store that wounded Giffords and killed six others last year.

KGUN/CNN