Philly detectives investigate the suspicious murder of an expectant mother.

Detectives land in the heart of Philly searching for a killer.

A neighborhood is shaken by the murder of a woman and her family.

A senseless murder shocks Philly's Russian-American community.

Police investigate a horrific crime involving a murdered 18 month old.

A five-year-old girl helps police track down her family's killer.

Police learn of a sinister motive behind the murder of a woman in Philly.

Detectives learn the how and why after finding a woman dead in her bathtub.

Police turn to the neighbors for help finding a 78-year-old man's killer.

Police hunt down a dangerous killer suspected of murdering a mother.

Police pursue an elusive killer suspected of murdering a college student.

Police investigate the carefully planned murder of a beloved DJ.

A Washington couple vanishes before their annual Christmas party.

A brutal murder sends shockwaves through the carnival community, and every performer is a suspect. Lobster Boy's death reveals long-buried truths, and a reign of terror meets a shocking end. Life at the carnival will be forever changed.

A blackmail note suggests a Texas housewife's murder was a family affair.

A string of horrific murders ignite fear and frustration in Atlanta.