A double homicide in New York City soon becomes a media circus when investigators reveal the two victims led a secret life; as the list of suspects grows, it's a call from the victims' home that may provide the only link to the killer.

The investigation into a Florida woman's murder takes a bizarre turn when an out-of-state tip about a homicidal hitchhiker. But the smoking gun comes via a local pawnshop, revealing a killer who lurks dangerously close to home.

Georgia detectives investigate the timeline of a family involved in a triple shooting find motive in both their failing business and a local addict with a grudge. But the discovery of a hidden key ultimately unlocks the secret to the killer's identity.

Confessed fraudster Andrew Kissel is found stabbed to death in the basement of his rented Greenwich, Connecticut home. And in order to find the killer detectives must unravel every detail of his last 24 hours.

When Diane Holik's body is discovered in her Texas home, detectives are faced with one of the most pristine crime scenes they've ever encountered; they unearth multiple suspects, but only the victim's reconstructed timeline can identify the killer.

When a Louisiana man is shot in his sleep, detectives uncover details of his extracurricular love life and a death policy that promised to pay out, even in the event of his murder.

Amid rumors of buried treasure at a Louisiana pet cemetery, the property's reclusive owner is found wrapped in heavy chains at the bottom of a river. Somebody wanted her to disappear, but it will take over 20 years before police can find her killer.

After Genore Guillory is brutally murdered in her own home, investigators look at several suspects on the woman's final 24-hour timeline; unable to pin anyone down, the case goes cold, until a witness comes forward with the inside story.

When firefighters in Arlington, Texas extinguish the flames of an apartment fire, they discover the charred remains of 19-year-old Missy Grubaugh. Several of her restaurant coworkers soon come under scrutiny.

When a nursing student is shot dead outside a Houston community college, the search is on for a brazen shooter in a red car. Detectives retrace the last 24 hours of the victim's life, and unearth a number of potential suspects.

A man comes home to find his fiancée dead in the bedroom of their new home; the discovery of infidelity soon puts him firmly in the hot seat; as investigators piece together the victim's final 24 hours, they uncover a sinister plot.

Sixteen-year-old Theresa Burns is brutally murdered in her family's Indiana home; though investigators believe they've found the murder weapon, it will take a quarter of a century before they close in on the killer.

When a woman is murdered in her Alabama home, investigators receive a lead pointing to a high-profile suspect, but it will take a decade before their circumstantial murder case has enough substance to go to trial.

A successful vacuum salesman is gunned down outside his Indiana office; as detectives untangle the victims' final 24 hours, all the clues point to a hired hit.

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.

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.

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