Hayward Police Sergeant Scott Lunger, 48, was shot and killed during an early morning traffic stop in Hayward, Calif. on July 22, 2015. (KGO-TV)
San Jose Police Officer Michael Johnson, 38, was shot and killed while responding to a 911 call at an apartment in San Jose, Calif. on March 24, 2015. (KGO-TV)
BART Police Sergeant Tom Smith, 42, was shot and killed by friendly fire while conducting a probation search in Dublin, Calif. on January 29, 2014. (KGO-TV)
Santa Cruz Police Detective Elizabeth Chase Butler, 38, was shot and killed while following up on a sexual assault investigation in Santa Cruz, Calif. on February 26, 2013. (KGO-TV)
Santa Cruz Police Sgt. Loran Lee "Butch" Baker Jr., 51, was shot and killed while following up on a sexual assault investigation in Santa Cruz, Calif. on February 26, 2013. (KGO-TV)
CHP Officer Kenyon Youngstrom, 37, was shot and killed while conducting a traffic stop on I-680 in Alamo, Calif. on September 5, 2012. (KGO-TV)
Vallejo Police Officer James Capoot, 45, was shot and killed while chasing a bank robbery suspect in Vallejo, Calif. on November 17, 2011. (KGO-TV)
Daniel Sakai, 35, was one of four Oakland police officers who were shot and killed by a wanted parolee in Oakland, Calif. on March 21, 2009. (KGO-TV)
Sergeant Ervin Romans II, 43, was one of four Oakland police officers who were shot and killed by a wanted parolee in Oakland, Calif. on March 21, 2009 (KGO-TV)
Sergeant Mark Dunakin, 40, was one of four Oakland police officers who were shot and killed by a wanted parolee in Oakland, Calif. on March 21, 2009 (KGO-TV)
John Hege, 41, was one of four Oakland police officers who were shot and killed by a wanted parolee in Oakland, Calif. on March 24, 2009 (KGO-TV)
Martinez Police Sgt. Paul Starzyk was shot and killed while responding to a shots fired call at a hair salon in Martinez, Calif. on September 8, 2008. (KGO-TV)
San Francisco Police Officer Bryan Tuvera, 28, was shot and killed while trying to arrest a wanted escapee from a state correctional camp on December 23, 2006. (KGO-TV)
East Palo Alto Police Officer Richard May, 38, was shot and killed at point blank range in East Palo Alto, Calif. on January 7, 2006. (KGO-TV)
San Leandro Police Officer Nels "Dan" Niemi, 43, was shot and killed in an ambush attack while investigating a disturbance call in San Leandro, Calif. on July 25, 2005. (KGO-TV)
Officer Larry Lasater succumbed to gunshot wounds sustained the previous day while attempting to arrest robbery suspects in Pittsburg, Calif. on Sunday, April 24, 2005. (KGO-TV)