Dental records show a corpse's identity to be a woman who supposedly died over three years ago from a brain aneurysm.

A small north Wales community is in fear after the ritualistic murder of an elderly woman. Police are convinced the killer is a local. Forensic evidence mounts, and the net closes in.

Seventeen-year-old Jodie Chesney was stabbed in the back while hanging out with friends in the local park. An obscure clip of CCTV helped to catch her killers.

After a gruesome discovery in a London canal, the investigation leads police to believe they're dealing with a serial killer. He's been careful to cover up his crimes, but forensic experts uncover hidden clues to expose the truth.

A group of Pakistani men in Glasgow, Scotland, set out for revenge against a Scottish gang by brutally murdering a random white teenager.

After a student is found dead in his car, detectives struggle to unravel a sordid, and lethal, family plot surrounding the victim and his girlfriend.

A university lecturer’s murder, stabbed to death in a park, marks the start of a killer’s reign of terror as more stabbings follow, with authorities scrambling to keep up.

A family confront suspected moped thieves with fatal consequences. A close-knit London community demand justice, helping forensic specialists uncover evidence to unmask the knifeman.

Officers from the Metropolitan Police uncover a shallow grave in the back garden of a missing woman, leading detectives on an international manhunt.

Beginning with a body found in a ditch in 2013, a serial killer investigation takes on a new dimension of importance after two more attempted murders are reported.

After the shocking discovery of a man wrapped in a shower curtain and buried in a deep makeshift grave in the back garden of a Surrey home, forensic experts expose a dark secret.

Reports of a riot-level attack bring authorities to South London, only to learn that one victim, an 18-year-old boy, has already died in hospital.

Police receive a call that 21-year-old student Libby Squire is missing. Humberside Police launch one of their biggest-ever missing persons searches. Then a body is found in an estuary.

A woman is found dead in a playground. When DNA links the murder to a series of sexual assaults in the area, forensic analysis of a water bottle identifies a dangerous predator.

In 2002, an 87-year-old pensioner was killed after a man broke into her home and sexually assaulted her, but police were stumped when none of the DNA evidence came back a match.

After a 17-year-old is found dead in the family kitchen, authorises’ first lead is a sloppy attempt at clean-up where the murderer has poorly tried to stage the death as suicide.

After a vulnerable man is found dead in his bedroom, authorities declare a crime scene and begin an investigation before running into difficulties.

After a 65-year-old woman is found murdered just outside her home, a manhunt for the killer runs into repeated problems with evidence and forensics.

After a brutally murdered oil rig worker is found in a burnt-out car, the quiet Scottish town soon becomes inflamed with rumours and fear.

Police respond to what seems to be a hit-and-run leaving three men critically wounded, but while teams begin to gather evidence one dies in hospital.