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A beloved local teacher is brutally attacked in her Pennsylvania home; after 27 years, dedicated investigators trace her killer.

In 1979 two young boys find their mother's dead body in the living room; how the investigators track down the killer with no solid leads.

A beloved local teacher is brutally attacked in her Pennsylvania home; after 27 years, dedicated investigators trace her killer.

In 1979 two young boys find their mother's dead body in the living room; how the investigators track down the killer with no solid leads.

Paid programming.

Paid programming.

Paid programming.

Paid programming.

A man convicted of murdering a woman in her upscale Austin, Texas, home tells his story for the first time.

Convicted murderer Drew Peterson speaks out about the murder of his third wife and the disappearance of his fourth wife.

A Jacksonville, Fla., firefighter discovers a disturbingly violent scene in his darkened bedroom on a Halloween weekend.

When Cara Ryan shoots her ex-husband and accuses him of threatening to kill her, police question her motive.

A California woman's two former husbands are mysteriously murdered, nearly 20 years apart.

A woman sees a mysterious and deeply unsettling occurrence in her neighbor's yard; she wonders if it was an accident, but the truth will prove to be divisive.

Rocky Mountain National Park rangers question whether a woman's fatal fall was an accident or the result of an act of violence.

Strychnine Death; Kidnapped Executive; Update: Murder in Connecticut; Swoops and Squats; Wandering Fishman; Major Lazarus.

A respected couple's murder leaves police puzzled and a blood-stained card at the scene is looked at again in the hopes it will yield new clues.

After a woman disappears on a bone-chilling night, her husband provides a strange alibi, claiming he was camping at the time with their two young sons.

Paid programming.

Paid programming.