When the badly decomposed body of Margarita Scott is found in the backseat of her estranged husband's missing SUV, investigators must interview everyone close to her to retrace her final steps.

When a small-town Michigan couple is gunned down in their own home, footprints in the snow and loose lips will lead police to their killer.

Two young girls arrive home from school 10 days before Christmas and find their father dead; police narrow the timeline of the murder down to an eight-minute window before the girls walked in the door

When newlyweds Joe and Olga Connell are gunned down outside their Wilmington, Del., home, police investigate a sibling rivalry, a business partnership plagued by drugs, and an outlaw motorcycle gang.

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Snowplow King Randy Scheffield is found shot dead in his bed by his wife on the first snowy day of the season, and Ohio detectives look into Randy's business to establish a motive.

A young Iowa man is shot dead while he sleeps peacefully next to his fiancée. Investigators wonder how she remained unharmed, and suspicion quickly swirls around her and two of her ex-boyfriends.

A two-bit Florida criminal is arrested while driving a stolen convertible that has blood in the backseat, and its owner, a 49-year-old hotelier named Sabine Musil-Buehler, is reported missing; the case expands to include a possible homicide

When the body of 43-year-old Tina Coronna is discovered in the backseat of her abandoned truck, detectives must piece together clues gleaned from the victim's emotional husband, his mistress, and a neighbourhood vigilante

A woman is gunned down in her garage after finishing a shift at work and investigators must search in vain for a motive in the brutal murder. When her boyfriend finds notes she wrote prior to the crime, the case is flipped on his head.

A retired man is horrifically murdered by an acid attack in Florida.

A car explosion outside a Tucson country club leaves a business tycoon dead. Detectives determine the killer detonated the homemade bomb at close range, and the list of suspects soon includes mobsters, defrauded investors, and the victim's ex-wife.

When a charming 33-year-old is gunned down outside his home, detectives must comb over every detail of his personal life, professional dealings, and extracurricular activities to figure out who could commit such a brutal crime, and why.

A concerned husband fails to get in touch with his wife after an alarm is tripped at their house, so he calls on the police to check it out. Upon arrival, they find his wife dead and try to connect the dots between an earlier burglary and a love triangle.

A 45-year-old yoga instructor is found gunned down on his front porch on a hot September morning in Tucson. With evidence of a burglary, detectives wonder if the victim interrupted the crime. The case proves much more complex when a witness steps forward.

A popular college student is found stabbed to death in her apartment the day after Thanksgiving. Detectives in Jacksonville Beach must piece together her last known movements to pinpoint the time of the murder, and then they must find her brutal killer.

A cold-blooded murder of a 39-year-old woman sends detectives in Oldsmar, Florida on the hunt for a killer, and their only clues are three letters written in blood and a pizza delivery.

A 27-year-old law student is reported missing, and when investigators later find human remains in the trash can behind her apartment, it's undeniable that the two are related. Police in Macon, Georgia, must act fast to catch a cold-blooded killer.

A 30-year-old woman is reported missing by her concerned husband after she fails to report to work. When her abandoned car is found, traces of blood in the trunk indicate more than just a disappearance - it's clear she has been murdered.

A former marine's death reveals a string of angry coworkers and irate exes.

The murder of a beloved father days before Christmas shatters his family.

A 42-year-old Russian woman living the American dream in Texas is savagely gunned down in her garage. As investigators work the case, the list of suspects includes her controlling ex-husband, her boyfriend, an obsessive admirer, and a generous mentor.

A 36-year-old woman lies strangled to death in her own home. Clues at the scene indicate she knew her killer well enough to let them in and that the resulting murder was spontaneous. Now, police race to discover who could want this mother dead and why.

A popular Wisconsin funeral director and his intern are murdered in cold blood. The case stalls for two years before a criminal profiler takes a fresh look and sees only one viable suspect -- someone the police never considered.

When a 42-year-old woman is strangled to death and posed in an unusual way in her bedroom, detectives are on the hunt for someone who would have wanted to humiliate her after murdering her. A hidden 911 call turns the case on its head.