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

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.

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.

A tight-knit Georgia community is in shock when a 41-year-old woman is bludgeoned to death in her own home. As detectives look to piece together her final hours, a story from behind bars reveals the shocking motive for murder.

Searching for a dismembered New Hampshire woman's killer, police identify a series of potential suspects including a mysterious drifter named Razor. But the truth lies in a missing persons report, and a one-eyed teddy bear.

In rural Michigan, 34-year-old Deborah Boothby is run over on the highway, and for nine years the case goes unsolved. That is, until a team of detectives review the evidence and the hit-and-run cold case becomes a murder investigation.

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.

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

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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.

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A young woman is found floating in a river off Merritt Island, east of Orlando, Florida. And as the circumstantial evidence piles up, the shifting story of one suspects' timeline ultimately becomes the smoking gun.

The body of a 16-year-old high school cheerleader is found floating in a river bordering Texas and Oklahoma; the police investigation unearths several promising suspects, then a break points to a killer already in their midst.

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

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In an affluent Atlanta suburb, a young boy is stabbed 18 times when he returns home from school, and his mother's lifeless body is discovered in her bedroom; a neighbor's chilling story points police toward a psychopath.

When an 18-year-old Staten Island woman is murdered in her home, the media turns her secret into a front-page scandal. But a meticulously constructed timeline allows detectives to close in on their number one suspect.

Popular newlyweds Rick and Gail Brink are shot execution-style in their Michigan home. But it will take 25 years before investigators uncover a flaw in the timeline that convinces them of the killer's guilt.

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Investigating an execution-style murder in a luxurious Miami suburb, detectives uncover a thriving law practice that made plenty of enemies, a business partner caught in a lie, and a troubled son with a lifelong grudge.