Writing career
Wambaugh's perspective on police work led to his first novel, The New Centurions, which was published early in 1971 while Wambaugh was still a detective. He later quipped that suspects would ask for his autograph.
Soon turning to writing full time, Wambaugh mixed writing novels (The Blue Knight, The Choirboys, The Black Marble) with nonfiction accounts of crime and detection (true crime): The Onion Field. His later books included The Glitter Dome (a TV-movie adaptation that starred James Garner and John Lithgow), The Delta Star, and Lines and Shadows.
Beginning with The Black Marble in 1977, Wambaugh included satirical observations of the Southern California "rich and famous" lifestyle. The Black Marble parodied dog shows and the fading lifestyle of "old" Pasadena. The Glitter Dome explored the pornographic film industry, The Delta Star delved into the Nobel Prize and scientific research, and The Secrets of Harry Bright savaged the Palm Springs lifestyle of wealthy people. The Golden Orange was set in Orange County while Finnegan's Week was set in San Diego; and Floaters was set in San Diego.
In 1992, Wambaugh generated controversy with his nonfiction book Echoes in the Darkness, based on the murder of Susan Reinert, a teacher in the Upper Merion School District in suburban Philadelphia, Pennsylvania. Critics alleged that the author paid prosecutors in the trial of principal Jay C. Smith to funnel information to him before an arrest was made. Smith's conviction was overturned by the Pennsylvania Supreme Court on the grounds that the prosecution hid the existence of sand that could have supported Smith's case. The chief investigator, John J. Holtz of the Pennsylvania State Police, later admitted having accepted $50,000 from author Wambaugh. Smith sued the police for collusion to falsely convict him, but lost after a federal appeals court concluded that despite his release, evidence of his guilt remained overwhelming. The earlier murder conviction of Smith's alleged co-conspirator, William Bradfield, remained undisturbed. Bradfield died in prison.
One of Wambaugh's most known nonfiction books is The Blooding, which tells the story behind an early landmark case in which DNA fingerprinting helped solve two murders in Leicester, England. The DNA evidence resulted in the arrest and conviction of Colin Pitchfork.
In the 2000s, Wambaugh also began teaching screenwriting courses as a guest lecturer for the theater department at the University of California, San Diego. In 2003, Fire Lover: A True Story brought Wambaugh his second Edgar Award, for Best Crime Fact book. In 2004, he received an MWA Grand Master Award.