Detectives hunt for the murderer of a businessman who was shot dead in his bed two days after Christmas. They try to find the killer by looking at the last 24 hours of the victim's life.

A Portland factory worker finds his missing SUV two months after it went missing, with the body of his estranged wife in the back seat.

Katrina Smith is reported missing in a close-knit community near Chicago, and detectives are faced with three prime suspects when her body is found in a river.

When a small-town Michigan couple is slaughtered in their own home, the only hard evidence is a trail of footprints in the snow, and the case soon goes cold. That is, until a random tip leads investigators right back to square one.

Police investigate when the body of a 24-year-old college student is found dumped in a Brooklyn neighbourhood.

Just days before Christmas, an Ohio man is gunned down in his home. And as detectives narrow the timeline to a mere eight-minute window, they need to determine the identity of a mystery man with a sinister motive.

Florida detectives suspect a missing 49-year-old hotelier named Sabine Musil Buehler has been murdered. And in the no-body homicide, narrowing down the timeline proves more critical than ever

As detectives investigate the brutal murder of a Tampa bartender, it’s the victim’s own handwritten notes that break the case wide open, and the team soon closes in on a manipulative predator who cleverly outsourced his cold-blooded ambitions.

A media firestorm erupts in Georgia when a law student's dismembered torso is discovered in a dustbin outside her home.

A 63-year-old retired Air Force captain is doused with sulfuric acid in the parking lot of a Florida supermarket. Eyewitnesses describe a shirtless attacker in his 30s, and investigators eventually uncover a deadly neighborhood feud and a manipulative mastermind with a barbaric plan.

An exploration of how the shooter of Desiree Sunford, a teacher, was brought to justice and how he nearly evaded the law altogether.

When an Iowa man is gunned down in his sleep, suspicions swirl around his fiancée. But the list of suspects soon expands to include her two ex-boyfriends and a mysterious case of stolen identity.