In December 2000 19-year-old Rachel Manning was murdered in Milton Keynes. Two men were wrongfully convicted, but new advances in forensics proved that evil always leaves a trace.
Looking at the case of the 'M25 Rapist', who became synonymous with fear and triggered one of the biggest manhunts in British history.
The Pittsburgh Police Force and the FBI raced against time to locate missing 13-year-old Alicia Kozakiewicz.
When the body of a child is found, Boston State Police have no leads, but with the help of the National Centre for Missing and Exploited Children, a trace is found.
Christine Eadie and Helen Scott vanished without a trace in October 1977. The police never stopped hunting for them, even changing the law to bring justice.
Digital forensics, traditional police work and a good old fashioned stake out stop a killer in his tracks, when all he has left is a digital trace.
The city of Baton Rouge goes into lock-down when women start to go missing, and investigators and family members work together to find that illusive trace of evil.
Residents in Baton Rouge discover a second serial killer is at work, but when he leaves a trace at a scene, the police get an unexpected breakthrough.
The body of EastEnders actress Gemma McCluskie was discovered in the Regent's Canal in March 2012, and detective work eventually led police to her brother, Tony.
The case of Tracie Andrews, who murdered her fiance Lee Harvey in 1996.
When a young couple were found executed in their home in October 2015, at first there were no apparent leads. The murderer, however, had left crucial evidence behind.
In late 1992, an attack led to an investigation which would last nearly a quarter of a century, but over time DNA profiling helped to close the case.
When a box containing human limbs was discovered in Florida, an investigation started that tested forensic capabilities, with detectives desperate to discover who the victim was.
When the bludgeoned body of Paul Gault was discovered in a pool of blood in a bedroom of his house, Northern Ireland police began to uncover the facts behind a brutal murder.
An examination of the case of David Jackson, who disappeared from home 15 years ago. The case remained unsolved until one investigator broke the case wide open.
The murder of Lynette White led to the longest murder trial in British history at the time. This programme examines how police work and DNA eventually led police to her killer.
The case of Wales' first documented serial killer, who in murdered three people in three months in 1973.
Rachel O'Reilly was savagely murdered in her home, in what looked like a burglary gone wrong, and a ground-breaking investigation finally put her killer behind bars.
Looking into the case surrounding the murder of 15-year-old Janet Commins.
After body parts were found in a Dublin city canal, a broad forensic investigation was needed to identify the victim, and lead Police to those responsible.
The mutilated bodies of two women sparked a massive police manhunt. With advances in forensic science, investigators brought Ireand's only living serial killer to justice.
The murder investigation surrounding the death of a young, defenceless woman led police to another case, where the science of DNA profiling helped to unravel the truth.
A killer, who identified then murdered his victims, caused a manhunt which lasted nearly three decades, but the science of DNA eventually led to his capture.
A popular, healthy, 60-year-old woman suffered a sudden, painful death. Detectives managed to trace the killer, despite their calculated and elaborate web of deceit.
A killer, who stalked and gained his victim's trust, enticed her to her death. Almost two decades later scientific advances brought the perpetrator to justice.
Beverly Therrien and her two lodgers were found beaten to death and despite the killer's careful planning, investigators identified and linked him to the crime.
A man returning from a family visit stops to help what appears to be a stranded group on the Belt Parkway in Brooklyn, New York City, and half an hour later, he is found dead.
The case of Laura Garza, a woman who went missing after a night out at a club. When she didn't turn up for work, a search ensued to find her as well as the men she left with.
A look into the case of Mary Ann Perez, a young woman who left a bar outside of New Orleans and never returned home.
Police discover a female victim beaten beyond recognition in Koonce Road, close to Calcasieu Parish, Louisiana in November 2009.
The story of the tragic murder of Brett Wentworth, how police tracked his killer down and how advanced forensic technology was key to solving the case.
5th December 1998; a woman was reported missing. Her car was found shortly after off the Interstate 95. Her disappearance rocked the community and tragically, her body was discovered two days later.
December 1986: Helle Craft was reported missing. Police questioned her husband, he claimed she was visiting her mum. From interviews with loved ones it became apparent something sinister had happened
On 17th September 2006, emergency services were called to a blaze in Pinyon Pines. A house was engulfed in flames and three burned bodies were discovered inside. It soon became clear this was no accident.
In August 2015, Jeanette and Jeffrey Navin were reported missing to police in Easton. An investigation began and it quickly became clear it wasn't a missing persons case, something sinister had happened.
Following the investigation into Brianna's kidnapping and murder and how police and forensics identified her killer.
Following the investigation into the murder of Dr. Teresa Sievers, which pioneered a forensic technique that solved the case.
Following the investigation into the death of Nikitta Grender and the extensive forensics that identified her killer.
Monstrous Murder in Morena is the story of how a dedicated police team and cutting-edge forensics solved Angela Kleinsorge's murder after 25 years.
The Fridge Killer follows the investigation into a truly spine-chilling murder in Nevada, that led police to uncover a serial killer.
The 36 year investigation into Virginia Freeman's murder and the forensics that identified her killer.
The search for Lori Hackingfollows the investigation into her disappearance and how a multitude of forensic techniques revealed her killer.
The investigation into the shooting and how the FBI and FMPD identified the killer and brought him to justice.
'Conned to Death' covers the murder of Michele MacNeill and how investigators and forensics brought her killer to justice.
When Kelsey Berreth vanishes on Thanksgiving in 2018, blood in her house and cell phone records indicate that there is more to Kelsey's disappearance than meets the eye.
The Murder of Susannah Chase follows the investigation into her harrowing murder and how forensics helped track down her killer.
Covering the 38-year investigation into Jeannie Moore's murder.
Following the investigation into a body found in a plastic container and how the killer is identified.
The terrifying assault of Ronda Guzman and the investigation that reveals her attacker after 33 years.
Following the 35 year investigation and forensic advances that identify Rosa's savage killer.
Following the investigation that reveals the predator responsible for numerous sexual assaults.
Tortured Love' is the story of a sadistic crime
Highway Horror' follows the investigation into the brutal murder of Shelby Weatherly
The Tantra Rapist' follows the investigation to catch a serial rapistLove' is the story of a sadistic crime
The Orem Murders' is the tragic story of a double-homicide
Tragedy in the Canyon' is the disturbing story of Jchandra Brown
The death of an innocent mother and how detectives identified her killer and proved his guilt.
The story of the senseless murder of Kay Mortensen and the unusual investigation that followed.
An innocent victim was lured to his death and cutting edge forensics helped to find the killer.
The story of the brutal and senseless murder of Sandra Rozzo. Attempting to understand how and why she died, and how determined police work and forensic science eventually crack the case.
Kristen Swanson was murdered in 1980 however the suspect was not found. Eventually following a 30 year investigation into her death revolutionary DNA techniques allowed the police track down her killer and bring him to justice.