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Cannon is a CBS detective television series produced by Quinn Martin which aired from March 26, 1971 to March 3, 1976. The primary protagonist is the title character, private detective Frank Cannon, played by William Conrad. He also appeared on two episodes of Barnaby Jones. Cannon is the first Quinn Martin-produced series to be aired on a network other than ABC. A "revival" television film, The Return of Frank Cannon, was aired on November 1, 1980. In total, there were 124 episodes.

Cranky but likable L.A. PI Jim Rockford pulls no punches (but takes plenty of them). An ex-con sent to the slammer for a crime he didn't commit, Rockford takes on cases others don't want, aided by his tough old man, his lawyer girlfriend and some shady associates from his past.

Former police officer Robert and his wife Katy left city life behind them after Robert was injured, whilst trying to protect a witness in his care. The witness, Susan Reynolds was fatally shot. Robert has been struggling with the guilt he feels over the death of Susan. In a bid to put the past behind them, Robert and Katy now run a guest house, hidden away in the idyllic Lake District. A surprise visitor turns up, DCI Mark Maxwell, an ex-colleague and old friend. He suggests that the guest house is perfectly positioned to operate as a safe house, Robert is tempted but will Katy agree?

Karl Alberg moves to a quiet coastal town to soothe a psyche that has been battered by big-city police work but finds himself needing to call upon all his skills to solve the murders that continue to wash up on his shore.

Jack Irish is a man getting his life back together again. A former criminal lawyer whose world imploded, he now spends his days as a part-time investigator, debt collector, apprentice cabinet maker, punter and sometime lover – the complete man really. An expert in finding those who don’t want to be found – dead or alive, Jack helps out his mates while avoiding the past. That is until the past finds him.

Bosch is now making a living as a private investigator two years after he quit the LAPD and finds himself working with one time enemy and top-notch attorney Honey “Money” Chandler. Meanwhile, Bosch's daughter Maddie is venturing into the world of the LAPD.

An eccentric private investigator with a criminal past recruits a disgraced ex-cop to help solve the disappearance of a Korean tech pioneer in the wilds of Far North Queensland.

Jim Bergerac is a detective sergeant in The Foreigners Office who likes to do things his own way. While dealing with his own personal demons Bergerac has a knack of finding trouble, and sometimes causing it.

Matt Houston is an American crime drama series that aired on ABC from 1982 to 1985. Created by Lawrence Gordon, the series was produced by Aaron Spelling.

Baretta is an American detective television series which ran on ABC from 1975 to 1978. The show was a milder version of a successful 1973–74 ABC series, Toma, starring Tony Musante as chameleon-like, real-life New Jersey police officer David Toma. While popular, Toma received intense criticism at the time for its realistic and frequent depiction of police and criminal violence. When Musante left the series after a single season, the concept was retooled as Baretta, with Robert Blake in the title role.

Case Histories is a British drama television series based on the Jackson Brodie detective novels by Kate Atkinson. It stars Jason Isaacs as Jackson Brodie.

An ex-cop hosts a late-night talk radio program while getting involved with his listeners' problems in his off-time.