Monica Quan, 28, and her 27-year-old fianc Keith Lawrence, were found shot to death in their car at a parking structure Sunday night, Irvine police said.
An investigation into their deaths led officials to Christopher Jordan Dorner, 33, a former LAPD officer and U.S. Navy reservist whose last known residence was in La Palma.
Quan's father, Randal Quan, represented the suspect in front of a disciplinary board shortly before Dorner lost his job with the Los Angeles Police Department. Dorner referenced that in a lengthy on-line manifesto that outlines his desire to seek revenge on people he believes were involved in his termination.
"Your lack of ethics and conspiring to wrong a just individual are over. Suppressing the truth will leave to deadly consequences for you and your family. There will be an element of surprise where you work, live, eat, and sleep," he wrote, referring to Quan and several others.
"Look your wives/husbands and surviving children directly in the face and tell them the truth as to why your children are dead," according to the manifesto.
"I never had the opportunity to have a family of my own, I'm terminating yours," he added.
Dorner was with the department from 2005 until 2008 and was formally terminated in 2009.
According to documents from a court of appeals hearing in October 2011, Dorner was fired from the LAPD after he made a complaint against his field training officer, Sgt. Teresa Evans, saying in the course of arrest she kicked suspect Christopher Gettler, a schizophrenic with severe dementia.
Randal Quan, who became a lawyer in retirement, was hired by the LAPD officers' union, the Los Angeles Police Protective League, to represent Dorner at an internal LAPD hearing prior to his termination in 2009, said Los Angeles Councilman Dennis Zine, an LAPD officer of 33 years who worked alongside Randal Quan for several years.
Not unlike a criminal trial, LAPD officers accused of significant administrative violation go before a Board of Rights hearing and are provided a defense attorney.
"(Quan) was the guy who was trying to help this guy keep his job," Zine said. The board may clear an officer of wrongdoing, or impose punishments ranging from time off to termination if the allegations are found true.
"Randy had a good reputation for being effective representing cops," Zine said.
"In this particular case, (Dorner) was found guilty and the determination was termination," he said. "Now he blames Randy for not putting out a good defense."
While Dorner apparently blames law enforcement for "destroying his life," Zine said, "He had the Board of Rights hearing when all the evidence comes out."
Zine described Quan as a successful attorney when it comes to defending police officers, as well as a compassionate man, "always concerned about fairness."
"Randy's a great guy," the councilman said "My condolences to him and his family."
Quan, who the LAPD said was the first Chinese-American captain in department history, retired from the police department in 2002.
In October of that year, Quan was hired as police chief at Cal Poly Pomona. Six months later he was fired.
Quan filed a lawsuit against the school on Jan. 15, 2004.
"Quan, the former Cal Poly Pomona campus police chief who was non-retained, filed this action complaining that he was terminated because he objected to hiring an African American female," according to minutes from a Trustees of the California State University meeting.
The lawsuit was settled for $32,000, said Dan Lee, spokesman for Cal Poly, and the case was dismissed on June 20, 2005.
Lee said he could not speak in detail about Quan's time at the university.
"We want to extend our deepest sympathies to Randal Quan and his family at this difficult time," Lee said.
Staff writer Brian Day and the Associated Press contributed to this report.