LOS ANGELES, Calif. -

A civil rights attorney said today an internal LAPD review concluded the department was justified in firing Officer Christopher Dorner, who later alleged racism in the agency and became the subject of a massive manhunt during a killing spree that left four people dead.

Dorner, 33, killed himself Feb. 12 while he was holed up in a Big Bear cabin that caught fire during a gun battle with law enforcement. In a lengthy manifesto posted online by Dorner, the former officer made multiple allegations of racism in the LAPD, which he claimed "has not changed since the Rampart and Rodney King days."

While the manhunt for Dorner was continuing in February, LAPD Chief Charlie Beck ordered a review of Dorner's case to determine whether his firing was justified and had been properly handled.  "I do this not to appease a murderer," Beck said then. "I do it to reassure the public that their police department is transparent and fair in all the things we do."

Civil rights attorney Connie Rice, co-director of the Advancement Project, told The Associated Press today that she had reviewed the department's internal report, which she said concluded that Dorner's firing was justified, and his allegations of racism and bias were unfounded.

Rice told AP that she had reviewed the roughly 40-page report on Dorner's firing. A department Board of Rights concluded that Dorner lied when he alleged a training officer had kicked a man during an arrest. He was fired for making a false report, and a judge later upheld his firing. She said the report concluded "the firing was justified and his allegations are completely unfounded."

Dorner worked as a police officer from Feb. 7, 2005, until Sept. 4, 2008. On Feb. 3, Dorner, also a former Navy lieutenant, gunned down the daughter and future son-in-law of the ex-police captain who represented him at his Board of Rights hearing, according to police.

The bodies of 28-year-old Cal State Fullerton assistant women's basketball coach Monica Quan and her fiance, 27-year-old USC public safety officer Keith Lawrence, were found in Lawrence's car in the parking structure of their Irvine condominium building.

The next day, Dorner posted the 6,000-word manifesto on Facebook, vowing to kill named LAPD officers and their families. Dorner was later involved in a shootout with Los Angeles police guarding an officer's home in Corona, leaving one officer with a graze wound to the head. About 20 minutes later, he fired on a pair of Riverside police officers stopped at a red light, killing Officer Michael Crain, 34, and wounding the other, according to police.

After being traced to Big Bear, Dorner engaged in a firefight with law enforcement authorities while holed up in a cabin. San Bernardino County sheriff's Detective Jeremiah MacKay was fatally shot during the gun battle.