According to documents from a court of appeals hearing, Dorner was fired from the LAPD after he made a complaint against his field training officer, Sgt. Teresa Evans. Dorner said that in the course of an arrest, Evans kicked suspect Christopher Gettler, a schizophrenic with severe dementia.
Richard Gettler, the schizophrenic man's father, gave testimony that supported Dorner's claim. After his son was returned home on July 28, 2007, Richard Gettler asked "if he had been in a fight because his face was puffy" and his son responded that he was kicked twice in the chest by a police officer.
Quan's father, a former LAPD captain who became a lawyer in retirement, represented Dorner in front of the Board of Rights, a tribunal that ruled against Dorner, police said. Randal Quan retired in 2002 and later served as chief of police at Cal Poly Pomona before he started practicing law. Quan did not immediately return a message seeking comment.
Dorner said in his online rant that after his dismissal that he lost everything, including his relationships with his mother, sister and close friends.
"Self-preservation is no longer important to me. I do not fear death as I died long ago," the manifesto said. "I was told by my mother that sometimes bad things happen to good people. I refuse to accept that."
Dorner said he would use all of his training to avoid capture and track his targets.
Dorner also had served in the Naval Reserves, earning a rifle marksman ribbon and pistol expert medal. He was assigned to a naval undersea warfare unit and various aviation training units, according to military records, and took a leave from the LAPD and deployed to Bahrain in 2006 and 2007.
"I will utilize every bit of small arms training, demolition, ordinance and survival training I've been given," the manifesto read. "You have misjudged a sleeping giant."
Earlier Thursday, two LAPD officers en route to provide security to one of Dorner's possible targets, were flagged down by a resident at a gas station in Corona who reporting seeing the suspect. The officers then followed a pickup truck until it stopped. The driver, believed to be Dorner, got out and fired a rifle, police said. A bullet grazed an officer's head.
Later, two officers on routine patrol in neighboring Riverside were ambushed at a stoplight by a motorist who drove up next to them and opened fire with a rifle. One died and the other was seriously wounded but was expected to survive, Riverside police Chief Sergio Diaz said.
Diaz said news organizations should withhold the officers' names because the suspect had made clear that he considers police and their families "fair game."
The hunt for Dorner also led to two errant shootings in the pre-dawn darkness Thursday.
LAPD officers guarding a target named in the manifesto shot and wounded two women in suburban Torrance who were in a pickup truck, authorities said. Beck said one woman was in stable condition with two gunshot wounds and the other was being released after treatment.
"Tragically we believe this was a case of mistaken identity by the officers," Beck said.
Minutes later, Torrance officers responding to a report of gunshots encountered a dark pickup matching the description of Dorner's, police said. A collision occurred and the officers fired on the pickup. The unidentified driver was not hit and it turned out not to be the suspect vehicle, they said.
In San Diego, where police say Dorner tied up an elderly man and unsuccessfully tried to steal his boat Wednesday night, Naval Base Point Loma was locked down Thursday after a Navy worker reported seeing someone who resembled Dorner.
Navy Cmdr. Brad Fagan said officials believe Dorner had checked into a base hotel on Tuesday and left the next day without checking out. Numerous agencies guarded the base on Thursday. Fagan said Dorner was honorably discharged and that his last day in the Navy was last Friday.
Nevada authorities also joined the search, because Dorner owns a house nine miles from the Las Vegas Strip, according to authorities and property records.