College student Mark Fisher went out in Manhattan with friends one night and ended up shot to death outside a house party in Bensonhurst, Brooklyn. The puzzle of what happened to Fisher left investigators at a loss when fellow partiers put up a wall of silence.

We enter the mind of a cruel and sadistic predator whose acts of wanton violence - and subsequent arrest - are the beginning of a twisted tale of one man's madness and one woman's quest for the truth.

After Navy electrician Michael Jacobs comes home to find his wife, Suzanne, and his 3-year-old son, Colin, murdered, San Diego police race to catch a serial killer who leaves behind an unimaginable calling card.

In Lenexa, Kansas, young women disappear from their apartments as police piece together evidence showing the terrifying crimes are connected.

A young woman is ambushed and murdered in Utah's remote Big Cottonwood Canyon. A cryptic note leaves investigators wondering if her death was just a tragic coincidence or a brutal betrayal.

When the body of a young woman if discovered on a cold winter afternoon in South Carolina, police retrace her final movements to find the killer.

Police race to find a killer after the decapitated body of a talented chef is found near Speedway, Indiana.

A woman's walk home from a Friday night out at a dance club in Lubbock, TX, ends in murder. Her naked body is discovered under a bush right next to a church on Sunday morning. As the investigation unfolds, detectives realize the path to justice relies on following the evidence to an unlikely suspect.

A cold case detective re-opens a decades old murder and promises the young woman's family their long awaited justice.

An offer of help turns deadly when a young woman and her boyfriend find themselves stranded. Investigators are soon on the trail of a ruthless serial killer.

After the lifeless body of a popular teen girl is found lying on the side of the road, police look to her cell phone records to catch her killer.

A college student's courageous battle for survival may be the key to solving a vicious double homicide.

The discovery of a woman's brutally beaten body inside an abandoned trailer is the start of a 28-year search for her killer.

On January 11, 1988, 16-year-old Theresa Burns' brutally murdered body was found by her brother, Stephen, in their home in Mishawaka, IN. The ring of a doorbell overheard during Theresa's final phone call may be the key to solving her murder.

When a young teacher is murdered in her home, police must rely on the eyewitness testimony of a young neighbor who saw her killer lurking outside her window.

The gruesome murder of horse ranch owner Wendi Brant traumatises her friends and family; Police focus on her estranged husband, but there are other potential suspects that muddy the investigation and throw the case into a decades-long tailspin.

Police struggle to dissect the love triangle that led to the disappearance of 21-year-old married college student and mother Bethany Decker in Ashburn, VA; her jilted husband, Emile, and her jealous new boyfriend, Ronald Roldan, are prime suspects.

In 2014, police discover that Tiffany Pugh, the successful wife of a popular DJ, has been murdered in her home in East Point, GA; the array of video cameras in the neighborhood could help bring her killer to justice.

Police use a revolutionary new technique to sort through a long list of guests and employees at the Paradise Ranch to find the one person responsible for a savage murder...

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Will a heartbroken mother's quest for justice lead police to solve the murder of her daughter?

Will a heartbroken mother's quest for justice lead police to solve the murder of her daughter and a close friend?

Can police use a blurry image taken just seconds before a young woman's disappearance to find the man responsible for her savage murder?

Police are baffled after two young women are murdered during strikingly similar crimes along the same scenic bike trail just months apart.

Can police sift through a maze of phone records and grainy video to pick up the trail of the man who murdered a beloved preacher's wife?