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The story of Rodney Alcala, who was infamous for his TV dating show appearance during his murder spree, and who was linked to 130 deaths. (S1, ep 3)

Andrew Dawson: A profile of the double-killer who branded himself the 'Angel of Mercy', after murdering two of his neighbours in cold blood.

Retired Detective Ken Mains teams up with an inmate on death row to expose the secrets of unknown serial killer Joseph Naso. (S1, ep 1)

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. (S15, ep 3)

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. (S15, ep 4)

Documentary following the work of Britain's police dogs in real operations, sniffing out everything from drugs and weapons to counterfeit money. Ken Stott narrates. (S1, ep 9)

Documentary following the men and women who help keep motorists safe on some of the most perilous highways and byways of New Zealand. (S9, ep 5)

Documentary following the men and women who help keep motorists safe on some of the most perilous highways and byways of New Zealand. (S9, ep 6)

Documentary following the men and women who help keep motorists safe on some of the most perilous highways and byways of New Zealand. (S9, ep 7)

Documentary following the men and women who help keep motorists safe on some of the most perilous highways and byways of New Zealand. (S9, ep 8)

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 9)

From explosive driving mayhem to dare-devil bikers, and even chaotic landslides, we've got it all caught on camera. (S2, ep 4)

Graham Young - The Teacup Poisoner: Fred Dinenage explores the crimes of Graham Frederick Young, who laced an entire factory's tea with deadly thallium. (S1, ep 2)

Dorothea Puente: The story of the "Death House Landlady", who took in elderly and disabled tenants, only to murder them for their social security paychecks.

...Most Evil Killers. Rodney Alcala: Examining the murderer who appeared on a dating game show in the midst of a killing spree that may have claimed as many as 130 victims.

The Mum Who Never Came Home: After Michelle Gunshon disappeared, police found CCTV footage showing her with a mystery man. They tracked him down, but where was she? (S3, ep 7)

Catching the Rochdale Ripper: When mum of three Eileen Jawczak was murdered, clues were minimal. Could police link her death to the Rochdale Ripper? (S3, ep 8)

Marina Erte: The story of Marina Erte, killed in Lincolnshire in 2016 by her estranged husband Gytis Griskevicius.

Jane Hings: The tragic story of 72-year-old Jane Hings, who was raped, burgled and killed in her home in Leicestershire by 25-year-old Craig Keogh.

Ben Field: The 'housemate from hell', Ben Field plotted the death of his two elderly landlords in a bid to inherit from their estates. (S7, ep 2)

Nathan Matthews: A family's worst nightmare occurs when 16-year-old Becky Watts goes missing, and is found dead days later, murdered by her own stepbrother. (S7, ep 3)

A Killer in the Family: True crime series putting murders under the microscope and exploring how forensic science helped investigators solve them. (5 of 8)

The Saturday Night Strangler: Thirty years after three gruesome murders, familial DNA and the exhumation of a body finally closes the case. (6 of 8)

Retired Detective Ken Mains teams up with an inmate on death row to expose the secrets of unknown serial killer Joseph Naso. (S1, ep 1)

Sky Original true-crime documentary on the murder of Grace Millane following a Tinder date in 2018, a case that held a mirror up to a society with a problem of violence towards women.