A look at how police tracked down Stephen Port, the east Londoner responsible for murdering at least four men and committing multiple rapes.

An in-depth look at how police brought Tony McCluskie to justice after he murdered and dismembered his sister, EastEnders actress Gemma McCluskie, in 2012.

A look at how the Thames Valley Police investigated the death of a wealthy Oxford antiques dealer and ultimately tracked down and caught his killer.

The murder of four members of the Ding family by Anxiang Du in Northamptonshire in 2011, focusing on the key error that he made which led to his arrest.

In Louisiana, 23 young men are found dead over a nine-year period. Investigators search for the Bayou Strangler but a break in the case comes only after a key error by the killer.

Ten iconic and international murder stories from the last three years featuring interviews with convicted killers.

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When a kind old man is found murdered his family are devastated. However, the police investigating the case discover his niece's bingo habit and backlog of debts would lead her to kill.

Iconic and international murder stories featuring interviews with convicted killers. Each episode focuses on the key error that a killer made which led to their arrest.

Iconic and international murder stories featuring interviews with convicted killers. Each episode focuses on the key error that a killer made which led to their arrest.

A beloved firefighter, William Walker is killed on his driveway in Cleveland Heights, Ohio. The suspicion quickly turns to his second wife. Police quickly learns, she recruited a team of teenagers to help her do the hit.

When Sarah Wellgreen suddenly disappears, detectives pour all their resources into finding her. But after discovering no evidence of her, they investigate closer to home.

17-year-old Jayden Parkinson was attracted to the bad boy allure of Ben Blakeley. But he started to lead her down a chaotic path that resulted in her disappearance.

Natalie and Paul had a seemingly idyllic relationship. But when she suddenly disappears, the investigation uncovers a dark reality of control and violence.

When Katherine Smith connects with Tony Moore on a dating site, she believes she's finally found love. But her dreams shatter when his true identity is revealed.

The disappearance of Denise Williams' husband leaves her devastated. But, when his mother investigates, she discovers the heart-wrenching truth of his demise

Serial killer Donald Miller was jailed for the murder of four victims and two murder attempts. The survivors speak out as Miller's parole date draws near.

For every murderer behind bars, there was a mistake that gave them away. Investigators and those close to the case discuss the key error that led to an arrest.

When Susan Waring, a 45-year-old mum-of-five with learning difficulties, disappears in 2019, all eyes turn to the new man in her life, Alan Edwards.

On a stormy night in Memphis, Micah Rine Pate mysteriously disappears, leaving behind unanswered questions and a husband whose story just doesn't add up.

Keeley McGrath kept her struggles hidden. It was only after Anthony Davis took her life that her family discovered the silent torment she endured.

Kevin Lewis's refusal to let go of his ex-wife triggers a series of events involving a teenage hitman and an obsessed lover ending in tragedy.

When Kerry Woolley is murdered, her boyfriend Ian Bennett plays the role of the grieving partner. But detectives soon uncover a trail of deception.