LOS ANGELES (KABC) -- According to the LAPD, shooting suspect Christopher Jordan Dorner was fired because he lied about an incident back in 2007 when he was a rookie cop working alongside a training officer. 

Dorner filed a lawsuit in an effort to try to keep his job, but that lawsuit was rejected, and so was his appeal. That chain of events appears to have triggered Dorner's alleged revenge rampage.

Dorner served as an officer with the LAPD from 2005 until 2008, when he was fired for making false statements.

It was August 2007 when the rookie police officer and his training officer responded to a call of a disruptive man at a hotel in the South Bay. Dorner had just returned home from his year-long deployment.

According to court papers, Dorner and his partner struggled with the man, identified as Christopher Gettler. The training officer Tased the suspect, who fell into some bushes before being handcuffed and taken into custody. But that's where Dorner's story differs. According to Dorner's so-called manifesto, his training officer "kicked the suspect twice in chest and once in the face. The kick to the face left a visible injury on the left cheek below the eye."