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A Jacksonville firefighter discovers his wife's lifeless body in the bedroom of their gated home. His confession of infidelity initially makes him the prime suspect. But it's a stolen car caught on CCTV that ultimately leads investigators to the killer.

Investigating an execution-style murderin 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.

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.

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.

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.

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.

Fifteen-year-old twin girls make a horrific after-school discovery when they come home to find their mother floating dead in the bathtub. Their compelling testimony leads the investigation, but the hair-raising truth lies hidden in the details.

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.

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.

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.

The investigation into a Florida woman's murder takes a bizarre turn with 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.

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.

A Pennsylvania Sunday school teacheris executed in a sniper-style attack, and the killer seems determined to throw police off the scent. That is, until detectives unlock the killer's timeline and solve what was nearly the perfect murder.

Georgia detectives investigating 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.