Police say Dorner began his run on Feb. 6 after they connected the slayings of a former police captain’s daughter and her fiance with his angry manifesto.

Dorner blamed LAPD Capt. Randal Quan for providing poor representation before the police disciplinary board that fired him for filing a false report.

Dorner, who is black, claimed in his online rant that he was the subject of racism by the department and was targeted for doing the right thing.

Chief Charlie Beck, who initially dismissed Dorner’s allegations, said he would reopen the investigation into his firing — not to appease the ex-officer, but to restore confidence in the black community, which had a long fractured relationship with police that has improved in recent years.

Dorner vowed to get even with those who had wronged him as part of his plan to reclaim his good name.

‘‘You’re going to see what a whistleblower can do when you take everything from him especially his NAME!!!’’ the rant said. ‘‘You have awoken a sleeping giant.’’

Within hours of being named as a suspect in the killings, the 6-foot, 270-pounder described as armed and ‘‘extremely dangerous,’’ tried unsuccessfully to steal a boat in San Diego to flee to Mexico. After leaving a trail of evidence, he headed north where he opened fire on two patrol cars in Riverside County, shooting three officers and killing one.

With a description of his car broadcast all over the Southwest and Mexico, he managed to get to the mountains 80 miles east of Los Angeles where his burning truck was found with a broken axle.