DNA left on a cigarette butt leads investigators to the brutal killer of 84 year-old gun enthusiast Kenneth spearman

Police painstakingly trawl through hours of cctv footage, location data and forensic evidence to find the brutal killer of a heavily pregnant woman

An unlikely informant holds the key to justice when 59 year old antique dealer michael Griffiths is targeted and brutally killed in his home

A computer at vogue magazine held the key to identifying julie clayton, an ex-cult member who'd been assaulted and murdered upon leaving

It took 18 years to identify melissa halstead after her torso was found in a Rotterdam canal. But detectives never stopped working to catch her killer.

A seemingly ordinary family man is the prime suspect when his wife, three young children and mother-in-law are brutally killed after church.

The FBI investigates when a seemingly perfect husband flees the United States following the murder of his wife and three children

Two women are killed in the 70s and their cases go cold for over 30 years, until a chilling link between the two emerges.

Detectives look back on the case of Elijah Butler,murdered four days after he married his wife-by her long-term stalker.

Detectives reflect on how they gathered evidence to charge Melanie McGuire with murder when her husband's remains were found in multiple suitcases

Shock pours through a community when a devoted mother is fatally attacked with a machete on her way to pick up her children.

The story of Garry Malone, who brutally bludgeoned his wife to death before making a bogus TV appeal for her to come home.

17-year-old Jayden Parkinson was killed by her abusive boyfriend, Ben Blakeley, who then buried her in his uncle's grave.

The chilling crimes of Colin Pitchfork, who became the first person to be convicted of rape and murder using DNA profiling.

After ending her relationship, 15-year-old Maleha Masud pays the ultimate price when her ex-boyfriend starts a lethal blaze at her home.

After ending her relationship, 15-year-old Maleha Masud pays the ultimate price when her ex-boyfriend starts a lethal blaze at her home.

Newlyweds Annette and Frank Carlson are renovating their first home when Angelo Pavageau breaks in, kills Frank, and sexually assaults Annette. Annette later helps investigators to hunt down the assailant.

In 2002, Heath McGowan murdered 88-year-old Henry Marrott in his own Michigan home, but the case against the violent criminal would prove complicated for police investigators.

Police discover the bodies of Duane and Carolee Recob in the family home in Delavan, Wisconsin, and detectives leading the investigation soon uncover the sad truth about their killings.

While on her way to a romantic weekend, Kendra Hatcher is shot dead in cold blood, and police investigators soon suspect that a jealous former lover could be behind the murder.

Examining how Howell Donaldson III terrorised a neighbourhood in Tampa, Florida in 2017, killing four random strangers.

After Gordon Wardell makes an emotional appeal to find his wife's killers, police soon realise they must look closer to home.

Opportunity For Riches - Steven Sidebottom: Initially deemed accidental, handyman Brian McKandie's death was soon considered murder due to his severe injuries.

The Highway Hunter - Adam Leroy Lane: When police find the body of Monica Massaro in her home with 17 stab wounds, they're led to serial killer Adam Leroy Lane.

When Lanell Barsock is found dead in her home in Palmdale, California, evidence points to her boyfriend before investigating detectives start to focus on her best friend, Larene Austin.

Although 17 years had passed since his wife died in a car accident, Malcolm Webster found himself becoming the focus of Scotland's longest-ever criminal trial when police re-examined her death.

When Julie Jensen is found dead, police suspect her husband Mark of murder - despite the seemingly happy family life.

When elite racer Anna Wilson was shot and killed, police launched a manhunt to Costa Rica in search of Kaitlin Armstrong.

Benjamin Laing: Six days after Matthew Manwaring and his daughter Alison vanish, police uncover a grisly scene at Benjamin Laing's home.

Douglas Ward: When young kickboxing champion Niall Dorr was beaten to death in Dundalk, CCTV helped detectives convict his killer.