Kathy Folbigg claims she is innocent of killing her four children, in a case reminiscent of Sally Clark, whose first son died at 11 weeks, and second at just eight weeks.

While Sally Clark sits in prison for life, journalist John Sweeny and attorney Marylin Stowe look at her case and make their own startling discoveries.

Big-hearted Patti clocks out at the end of her shift at the factory and is never seen again. What happened to this popular mum and is a mystery man involved?

In 1990, a teenager is convicted of murdering his parents. Forced into a confession, Martin Tankleff spent 20 years trying to prove his innocence.

In September 2003 in Illinois, 62-year-old Mexican immigrant Felipe Ulloa tells his wife Eloisa he is going to a local bar to collect a $75 debt. He never returns.

At the Dorohusk border, a sniffer dog spoils a couple's birthday celebrations. Plus, customs officers search a vintage motorcycle for hidden contraband.

In Korczowa, customs officers uncover mysterious packets inside a car's fake fuel tank. Plus, a sniffer dog is deployed to search a well-known smuggler's van.

When a ranch hand is found dead in a river outside of Salt Lake City, investigators across two states must work together to catch the killer.

Fishermen find a 27-year-old man shot to death on a river embankment. A jailhouse call leads investigators to a twisted love triangle that ended in murder.

When mother Samantha McNorton vanishes without a trace, Ranger Holland steps in and launches a whirlwind investigation, determined to find her.

In 2017, an Ohio couple finds a dismembered body in a basement freezer. It unlocks a harrowing mystery surrounding a missing woman and a tragic love triangle.

Ohio biker Richard Beasley values family, faith and helping others. When he vanishes, police find an online monster has been luring local men to their deaths.

In Pennsylvania, Kevin and Joanne Dowling like to capture their kids' milestones on video. But when a woman in a nearby town is shot dead, Kevin is accused of murder.

A husband and wife take a road trip to Ohio to find their dream home. But, just one hour into their journey a seemingly random attack ends in tragedy.

When two bodies turn up in a car crash, investigators uncover the grizzly truth about a seemingly perfect relationship.

After the brutal binding, torture and murder of a woman in her home, her ex-husband calls 911, but police suspect he is the killer.

A woman falls to her death in the Rockies, her husband calls 911. The police must find out whether her death was really an accident or was she pushed.

Deputy Floyd Moore calls for backup when he sees a man acting suspiciously. When it arrives, Floyd has been shot but in his pocket is a lead to the shooter.

Sharon Denson, a 50-year-old mother, is found shot seven times in the street with no killer in sight. However, her dying declaration is a huge help to police.

14-year-old Alana Calahan's body was found in the woods at the back of her house. Alana's mother and sisters discuss this tragedy for the first time.

A suspected home invasion in Connecticut leaves a mother dead in the basement and her husband injured. Detectives learn there's more to the story.

Philadelphia police officers find four adults locked in a basement dungeon. The investigation leads across four states, resulting in multiple arrests.

Police fight to stop a stolen truck with a hostage inside, and a domestic call turns deadly when the suspect shoots at officers at point-blank range.

After the murder of two bar employees with a hammer, solving the case comes down to a confession letter from "The Devil," postmarked from "Hell."