The Last 24

A Jacksonville, Fla., firefighter discovers his wife's body in the bedroom of their gated home; his confessed infidelities make him the prime suspect until investigators spot a stolen car on CCTV.

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

After an 18-year-old woman is murdered in her Staten Island, N.Y., home, the media turns her secret into a front-page scandal; 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, Fla.; as the circumstantial evidence piles up, the shifting story of one suspects' timeline ultimately becomes the smoking gun.

After firefighters extinguish the flames of an apartment fire in Arlington, Texas, they discover the charred remains of 19-year-old Missy Grubaugh; soon, several of Grubaugh's restaurant coworkers 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; it will take more than 20 years before police can find the victim's killer.

Fifteen-year-old twin girls come home from school to find their mother floating dead in the bathtub; their compelling eye-witness testimony drives 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 woman's killer, New Hampshire police identify a number of suspects including a mysterious drifter named Razor; the truth lies in a missing persons report and a one-eyed teddy bear.

Newlyweds Rick and Gail Brink are shot execution-style in their Michigan home; it takes 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; the smoking gun comes via a local pawnshop, revealing a killer who lurks dangerously close to home.

A tight-knit Georgia community is left in shock after 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 teacher is executed in a sniper-style attack, and the killer seems determined to throw police off the scent; then, detectives unlock the killer's timeline and solve what was nearly the perfect murder.

A Georgia family is involved in a triple shooting; detectives examine the timeline, finding motives in the family's failing business as well as an addict's grudge; ultimately, the discovery of a hidden key unlocks the secret to the killer's identity.

Confessed con man Andrew Kissel is found stabbed to death in the basement of his rented Greenwich, Conn., home; in order to find the killer, detectives must retrace his last 24 hours on earth.