Season 4 - Episode Guide

A pedestrian check turns deadly when a cop is gunned down on a midnight patrol. The attacker flees with the officer's squad car...and her weapon. The stakes are higher than ever as investigators try to capture the person who killed one of their own.

When a beautiful home healthcare worker disappears during an icy New York night, loved ones lead the search for her safe return. But a series of incoming text messages and a mysterious missed call reveal a soul-crushing truth and a murder most evil.

After a night at karaoke, a pretty nurse vanishes into the frigid Wisconsin winter. Security footage reveals the woman left with a mystery man in a dark jacket. What detectives uncover is the coldest of crimes and a monstrous end to a beautiful life.

During an icy Wisconsin winter, a single mom vanishes. Police learn she was recently stalked by two men at a bar, but the danger doesn't stop there. A brutal assault, an anonymous email and a bizarre confession shed light on a deadly encounter.

When a single mother of three misses a routine bank run with her sister, panic begins to spread among the family. The nightmare becomes a reality when a passerby finds the beloved petite woman brutally assaulted, nude, and frozen in an alley.

After a woman is found slain in her bed, investigators use a bloody hand print, an ax and evidence from multiple break-ins to help solve her gruesome murder.

On a wintry December evening, a 29-year-old supermom doesn't return home after her meeting. Is she going to miss her daughter's first Christmas? Her family is devastated when the devoted mother is found frozen solid and dumped in the snow.

A married, father-of-three wakes up to every parent's worst nightmare-his youngest child dead, his daughter missing, and his son barely clinging to life. Will investigators be able to find the cold-hearted monster that brutally attacked this family?