There is not an abundance of personal detail in the manifesto, but he does allude to his background and beliefs.
He states he "never had the opportunity to have a family of my own" but doesn't elaborate, only issues a threat to the mothers, fathers, sisters, brothers and children of LAPD officers. He made good on that threat in at least one killing, that of a daughter of a retired officer, police say.
Dorner makes multiple references to his faith, or lack thereof. Again without elaborating, he states he is not a religious man and in a separate section of the manifesto mocks the Bible as "made of fiction and limited non-fiction."
"I'm not an aspiring rapper, I'm not a gang member, I'm not a dope dealer, I don't have multiple babies momma's. I am an American by choice, I am a son, I am a brother, I am a military service member, I am a man who has lost complete faith in the system, when the system betrayed, slandered, and libeled me. I lived a good life and though not a religious man I always stuck to my own personal code of ethics," he wrote. "I didn't need the US Navy to instill Honor, Courage, and Commitment in me but I thank them for re-enforcing it. It's in my DNA."
Dorner says he grew up in Norwalk, Calif., neighborhoods with small black populations and was "the only black kid" in his classes through seventh grade. He was disciplined for fighting as a youth, but only when classmates would call him racial epithets, he wrote.
He went to high school in the Los Angeles suburb of La Palma, where his mother still lives. Crystal Lancaster, who lives next door to the tan, stucco home, said it was "a big shock" to hear Dorner was the subject of a manhunt.
"We all couldn't believe it. We didn't know him that well, but he seemed like a really nice guy," she said.
While in high school, he played football and was part of the police explorer program, said another neighbor, City Councilman Gerard Goedhart.
He went to college at Southern Utah University, where he was a running back on the school's football team and graduated with a degree in political science in 2001, the school's athletic department spokesman Neil Gardner said.
"Chris Dorner is the last person I would ever think would do such," Gardner said Thursday. "He was a great kid."
Usera, his Southern Utah classmate, also had many kind words for Dorner, who he said was "smart and insightful" and "a perfectly rational human being." But he also conceded his old pal could be recalcitrant.
"He was a person of conviction and when he made up his mind about something, right, wrong or otherwise, he made up his mind and you weren't going to convince him otherwise," Usera said.
Though Usera received an "out-of-the-blue" phone call from Dorner four years ago complaining about conditions at the LAPD, he sensed nothing that would have foretold the mayhem that has unfolded in the last 10 days.
"Never anything that I experienced in a million years would lead me to conclude that this horrendous activity that he engaged in at this point was ever imminent or would ever be any type of concern," he added.
But if everything police say about Dorner is true, Usera said he isn't necessarily surprised.
"I think (his stubbornness) may be one of the things that brought about his demise in this case. I don't think once he got going on this, frankly, this mission of vengeance that he was on, based on his personality type -- the way I knew him -- there was not going to be any good end to it," Usera said.
After college, Dorner joined the Navy, receiving a commission as an ensign in July 2002. He trained in river warfare units and served a 2006-2007 stint in Iraq guarding oil platforms, according to Pentagon records.
He held a commission as a lieutenant until Feb. 1 and was rated as a rifle marksman and pistol expert, according to the records.
He also received several decorations, including the National Defense Medal, Iraq Campaign Medal, Global War on Terrorism Service Medal, Sea Service Deployment Medal and Navy Marine Corps Overseas Service Ribbon.
He enrolled in the LAPD Academy in February 2005 and spent four months on the streets as a trainee before being recalled to active duty for his stint in Iraq, police records state.