The dispute centers on a 2007 incident in San Pedro involving a man's arrest at a DoubleTree hotel. Two weeks later, Dorner accused his training officer of kicking the man after he'd given up.
The investigators' report said "the delay in reporting the alleged misconduct coupled with the witness' statements irreparably destroy Dorner's credibility." The report cited contradictory accounts from the arrested man and his father and denials by the accused officer and three hotel employees that the arrested man had been kicked. Dorner claims he was wrongly ousted for blowing the whistle on what he insists was police abuse.
Dorner challenged his firing for years, losing at every turn. First, the police department's Board of Rights rejected his appeal. Then, in October 2011, a judge ruled against his appeal, according to court records.
Beck, the Los Angeles police chief, said Thursday that Dorner's case had been "thoroughly reviewed" and said the department would not apologize to Dorner or clear his name.
But as his manifesto shows, Dorner is showing no sign of relenting.
He complained he had been railroaded out of the department after reporting police brutality by another officer. Dorner also complained of a continuing culture of racism and brutality in the LAPD.
Attacks on other police officers and their families, he said, are "a necessary evil that I do not enjoy but must partake and complete for substantial change to occur within the LAPD and reclaim my name."
"Look your wives/husbands and surviving children directly in the face and tell them the truth as to why your children are dead," Dorner wrote.
Such a chilling warning prompted Los Angeles police to set up 40 protective details in an effort to safeguard people listed in Dorner's letter, Beck said.
The chief acknowledged that this effort was taxing the department, which has been placed under tactical alert, meaning all officers must stay on duty.
"It's extremely, extremely manpower intensive," Beck said. "But the safety of my employees, people that come on the job to protect the lives of strangers, is extremely important to me. And I will expend whatever resource is necessary."