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The shocking story behind the extraordinary case of Crystal Hunnisett. Contains violence and graphic descriptions of child sexual abuse throughout. (1 of 2)

The shocking story behind the extraordinary case of Crystal Hunnisett continues. Contains violence and graphic descriptions of sexual abuse throughout. (2 of 2)

Derrick Todd Lee: The story of The Baton Rogue Serial Killer, known for murdering seven women in the area and sentenced to death for his chilling crimes.

John Straffen: Longest Serving Prisoner: Child killer John Straffen was spared the noose in 1951 because of his low IQ. He later escaped Broadmoor and struck again. (S2, ep 4)

Melanie Eam: A multi-state search unfolds following the death of a young gamer and his heartbroken mother's 911 call.

Sgt Hughes and Gipson patrol the streets in Northamptonshire, while Rob and Val help boozy revellers onboard Maidstone's Urban Blue Bus. (9/10)

Documentary series charting the exploits of the City of London police, charged with safeguarding the Square Mile at the heart of the crime-ridden capital. (S4, ep 5)

Documentary series from New Zealand following the madness and mayhem faced by intrepid officers as they pull over motorists for a variety of suspected offences. (S2, ep 7)

Documentary series from New Zealand following the madness and mayhem faced by officers as they pull over motorists for a variety of suspected offences. (S3, ep 1)

Documentary following the men and women who help keep motorists safe on some of the most perilous highways and byways of New Zealand. (S3, ep 2)

Documentary following the men and women who help keep motorists safe on some of the most perilous highways and byways of New Zealand. (S3, ep 3)

The Thames Valley Police provide a fascinating insight into car crime and its prevention. Plus, shocking video footage captures dangerous drivers in action. Strong language. (S2, ep 6)

Join Ireland's Customs teams as they, with the help of the Irish police, try to stop organised smugglers from bringing drugs, cars and even exotic animals into the country. (S1, ep 15)

Fly-on-the-wall documentary series following the men and women who defend Australia from drug runners, illegal immigrants and terrorists. (S6, ep 20)

The observational documentary series goes to the frontline of Australia's defence against customs, quarantine and immigration violations. (S7, ep 1)

Action-packed documentary following rapid response officers, the fastest cops in Britain, as they crack down on crime. Time is of the essence! (S3, ep 5)

Catching the Midlands Ripper: Two bodies are found just months apart in Leicestershire, but when the case goes cold, one woman's bravery could be key. (S3, ep 9)

Rodrigo Hernandez - The Grand Rapids Killer: What drives a man to murder a stranger? Detectives reflect on the case of Hernandez, who did just that. (S1, ep 2)

Connor Lyons: As the body of teenager Connor Lyons is found in the River Hull, police realise his death may be connected to the sale of a bike on social media.

Sabina Nessa: See how police used CCTV to trace the perpetrator of a crime that shocked the nation - the murder of teacher Sabina Nessa in London.

Todd Christopher Kohlhepp: A chilling profile of the vicious serial killer who claimed the lives of at least seven innocent people between 2003 and 2016.

Stephen Seddon: A look at the life of the convicted fraudster who murdered his parents in a cold-blooded crime driven by greed.

Catching the Birmingham Spree Killer: In 2000, the bodies of three women were found in Birmingham. Could police hunt down the dangerous killer? (S4, ep 6)

Shawn Grate - The Charismatic Killer: Described as charming, detectives saw another side to Shawn Grate when they found two decomposing bodies in his home. (S1, ep 4)

Sante And Kenneth Kimes: An investigation into the murderous mother-and-son duo, who killed their elderly landlady in a greed-fuelled ploy.

Anthony Arkwright: A look the savage killer who murdered his own grandfather and two others in 56-hour blood-soaked killing spree.

The Piketon Family Murders: In a rural Ohio village, eight members of one family are brutally killed across four different properties in a case that sends shockwaves through the community.

Donald Henry Gaskins: A profile of serial killer Donald Henry Gaskins who murdered more than a dozen people in South Carolina in the 1970s before being apprehended. (S9, ep 4)

Velma Barfield: She became the first woman to be executed by lethal injection after taking six lives. What drove her to commit these callous murders?