Christopher Jordan Dorner (June 4, 1979 – February 12, 2013) was a former officer of the Los Angeles Police Department (LAPD) who, beginning on February 3, 2013, committed a series of killings against the LAPD in Orange County, Los Angeles County, Riverside County and San Bernardino County in the U.S. state of California. The victims were law enforcement officers and the daughter of a retired police captain. Dorner killed four people and wounded three others. On February 12, Dorner was cornered by police in a cabin in the woods that was set on fire where he killed himself after a shootout with the San Bernardino County Sheriff's Department deputies in the San Bernardino Mountains.

A manifesto posted by Dorner on social media declared "unconventional and asymmetric warfare" upon the LAPD, their families and their associates unless the department admitted publicly he was fired in retaliation for reporting excessive force.