Dark knight killer presumed dead ...... ?

Who is Christopher Dorner? Whom did he allegedly kill? What were his motives for the shootings? What’s in his manifesto? Why are authorities having difficulty finding him? What’s the latest on Dorner?
Law enforcement sources directly connected to the case tell TMZ a body was found inside a Big Bear cabin, and they are all but certain it is Christopher Dorner -- who earlier engaged police in a gunfight before the cabin went up in flames.

 Positive identification may take a while because the body was badly burned, but our sources are convinced they have their man.

Cops had cornered Dorner in the remote cabin ... after reports came in that he robbed a nearby home, tied up the couple living inside and fled in a white Dodge pickup truck.

A state Fish & Game ranger fired on the vehicle, and cops closed in soon after -- resulting in a violent standoff ... during which tons of shots were fired, hitting two San Bernardino County deputies ... one of whom died at the hospital.

At this point, it's unclear how exactly Dorner died. Cops reportedly heard a single gunshot around the time the cabin ignited ... indicating Dorner might have shot himself.

Dorner was accused of murdering three people -- including one police officer -- in shootings that took place on February 3rd and February 7th in California. Two other police officers were injured in the shootings. 

Cops believe Dorner -- a former LAPD officer who was dismissed in 2008 -- posted a rambling manifesto on his Facebook page ... in which he declared "unconventional and asymmetric warfare" on the LAPD and their families.

Dorner is a 33-year-old former LAPD officer and U.S. Navy reservist. He was fired from the LAPD in 2009 after a disciplinary board determined he made false statements about his training officer engaging in police brutality. In his manifesto, Dorner contends he was telling the truth, and accused the LAPD of whitewashing the incident.   

Whom is he accused of killing?

The first victims were Monica Quan, 28, and her fiancée, Keith Lawrence, 27. Quan and Lawrence were found shot dead inside their car Feb. 3 in Irvine, Calif.

Quan and Lawrence weren’t random victims, although they are not directly related to Dorner’s gripes with the LAPD.

Quan is the daughter of former LAPD Capt. Randal Quan, who served as Dorner’s attorney during his appeal of his firing.

Murdering Quan appeared to be payback for her father’s unsuccessful effort to have Dorner reinstated. Dorner allegedly taunted Randal Quan when he purportedly called his former lawyer after Monica Quan’s murder.

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“You should have done a better job of protecting your daughter,” a man claiming to be Dorner told Quan, court documents obtained by ABC News showed.

Four days after the Quan and Lawrence murders, Dorner allegedly struck again on Feb. 7 in Corona, Calif. He fired on two police officers on patrol, killing Riverside Police OfficerMichael Crain.

What were his motives for the shootings?

According to his manifesto, Dorner purportedly committed the murders to “clear his name,” referring to the move to fire him and the disciplinary board’s ruling that he made false statements.

“I know most of you who personally know me are in disbelief to hear from media reports 

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