A diligent art student lies stabbed to death in bed. The ferociousness of the crime makes little sense considering the quiet co-ed has no known enemies. However, police soon meet someone whose secret hatred for her reveals itself as a night of pure horror.

A Tennessee college student returns to campus to find her friend and roommate Heather Maples viciously strangled in her bed. The outgoing co-ed has many friends, but police fear that on August 7, 2015, one of those pals turns out to be her worst enemy.

In Brooklyn's Hasidic community, Menachem Stark enjoys life as a respected businessman and father to seven children. In 2014, his wife calls police when he fails to return home, and a subsequent search leads to a burning dumpster that holds a dark secret.

The beating death of a 15-year-old girl in Draper, Utah, outrages her parents, who had adopted her five years prior. One witness implicates a local drug dealer and another a mysterious gang member, but it seems almost everyone is lying.

Early one May morning in 2012, a Kentucky pharmaceutical company employee stumbles upon the body of a close colleague. Someone has beaten this devoted wife and mother to death, and police must eliminate her coworkers as suspects, one by one.

In affluent Colleyville, Texas, a bloody home invasion leaves the housekeeper dead - but police soon discover she was the intended target all along. Little did the sweet grandmother know just how many people were impatiently waiting for her to die.

A single woman hosts a dinner party on the same night she's mercilessly stabbed to death. At the scene, police notice her signature waist-length hair is cut short, leading them to suspect the killer not only knows the woman - but is obsessed with her.

A couple vanishes from their Washington home just days before Christmas.

A single mother's murder moves police officers to tears at the crime scene.

High school Freshman Tina Faelz ditches detention and heads for home - but someone murders her along the way. Suspects are plentiful, including a known sex offender, but decades pass before two determined detectives finally deliver justice for Tina.

A killer guarantees that a popular square dancer will do-si-do no more.

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.