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.