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One evening in 2010, 40-year-old Rachael Anderson called a friend regarding a home improvement project. Then, she vanished and eight years later is still missing.

College student Jessica O'Grady vanishes late one night. When another woman disappears without a trace, locals wonder if a serial killer is on the loose.

When a hardworking mum is shot dead on a sidewalk in 2005, police worked tirelessly to catch the killer. With a murderer on the loose, it was a race against time.

When a DJ is found brutally murdered outside a radio station, police originally believe it was a robbery gone wrong. The truth reveals he was not just a random victim.

When a young mother is found dead in her car on New Year's Day, there's very little evidence. Almost 20 years later, her sister joins a rookie cop to catch the killer.

A 45-year-old murder investigation gets fresh momentum when the victim's nephew takes the case on. And his search for the truth unearths hidden secrets.

A mother and her adult son a shot to death in an apartment complex. With no initial suspects, detectives find answers in shell casings, shoe impressions, and DNA.

A man calls 911 when he finds blood inside a friend's home: a community activist has been shot dead. Bloody footprints and a credit card trail lead to the killer.

.. A terrible event tore Sarah Ripoli's family apart when she was six years old. The discovery of secret writings from beyond the grave helps her to understand the truth.

The future looks bright for Donna Andersen when James Montgomery enters her life. But she soon makes a discovery that turns her marriage into a living nightmare.

When the body of a professor and family man is found in the office of a used car dealership, Det. Postiglione remembers the tell-all clue that pinpoints the killer.

Det. Postiglione examines the double homicide of two college students near a Nashville university. When a third victim is shot dead, Pat launches a state-wide manhunt.

In Oklahoma City, two masked gunmen allegedly ambush a couple and kill the husband. With few leads, police use forensics and neighbourhood gossip to solve it.

A young woman relocates to Florida in search of some peace and a fresh start. But what once appeared to be a remote paradise soon shows its true colours.

Charred and decomposed human remains are found in the Poconos. It takes Pennsylvania State Troopers more than a decade to solve the case.

A domestic dispute turns into a hostage situation with children's lives at stake. And, an apparent vehicle accident turns into a shocking multiple murder.

When Jacob Craggett is murdered in a crossfire, it brings back terrible memories for his family, who lost another relative to gun violence ten years earlier.

When an army veteran is tragically murdered, it rocks the town of San Antonio, Texas. The case goes cold until police receive an unexpected phone call.

Relatives of 'Suffolk Strangler', Steve Wright, reveal how his shocking crimes impacted the family. Were there any signs of his murderous intentions.

Relatives of serial killer Bobby Joe Long reveal how his shocking crimes impacted the family. Were there any signs of his murderous intentions.

A man becomes fixated on his co-worker, believing they should be married. The problem is, she's already married - to a jealous husband.

Tim Koile has it all - a beautiful wife and loving family. But a sordid affair with his seductive new neighbour quickly turns into something much more sinister.

A young mother is found brutally murdered in her home in New York. Snowy footprints lead into the home but with no exit trail, how did the killer escape.

When police discover Betty Sue Short murdered in her home, they notice disturbing similarities with another recent killing in the community of Kingsport, Tennessee.

In Pennsylvania, the body of a computer programmer is found submerged in a bathtub. Leads are scarce until detectives uncover a series of troubling voicemails.

A former mayor of an Ohio town turns up dead in his hunting cabin. Detective Ryan Allar explores whether this is political retaliation or something more personal.

17-year old Shafelia's disappearance was a mystery - until her sister is arrested for a robbery. Carol Wardell vanished and her husband left tied-up.

Bestselling author, Helen Bailey, was a wealthy widow. After finding love again with Ian Stewart she vanished. He helps in the search - but was it a cover-up.

It is love at first sight for Michelle and Dennis. But soon, the dark past of Michelle's new husband rears its ugly head and ends in a double homicide.

A woman enters into an affair with her daughter's grandfather, causing a major rift in the family and eventually leading to a bloody Texas showdown.

A retired couple leave home to sail to Thailand. Just as their dream becomes reality, utter evil strikes and a night of paradise turns into an unfathomable nightmare.

Kelley and her husband love each other but disagree about their love of water. One day, she decides to surprise him on the boat, only for her and the crew to never return.

Ex-marine Raymond McLeod seemed to be single mum Krystal's knight in shining armour. But, one night he allegedly strangled her in a hotel and fled the country.

John Walsh profiles a man who is believed to have murdered his ex-girlfriend. Callahan Walsh investigates a St. Louis man accused of shooting a pair of twins.

When Nisha Patel-Nasri is stabbed on her doorstep, is her husband, Fadi's TV appeal fake? And Miles Evans is a suspect when his stepdaughter Zoe vanishes.

CSI Alina Burroughs travels to Minnesota to explore the suspicious death of Jane Rhodes, a wife and mother who drowned during a 1996 vacation.

Journalist Maria Awes teams up with serial killer Todd Kohlhepp's biographer and FBI 'Mindhunter' John Douglas to unearth the extent of his murders.