Season 18 - Episode Guide

When a hero firefighter is found savagely murdered in his own home, the trail of evidence police find takes them on a twisting and tension filled journey to justice.

When a young girl kidnapped from her bed in the middle of the night is found dead in a nearby canal, it marks the beginning of one of Salt Lake City's most notorious child murder investigations.

After a four-year-old girl finds her mother's lifeless body, police must try to unravel a puzzling mystery. A murder investigation in which they must rule out multiple solid suspects before they arrive at the unlikely killer.

Two sisters are found murdered in a heart-breaking double homicide. The evidence police discover paint a grim picture of the crime but will it lead them to the killer?

A teenage girl disappears on her way to visit friends. As police retrace her last known movements they uncover a terrifying possibility, the 16-year-old may have been kidnapped by an international human trafficking ring.

Police investigate a residential house fire and discover it was intentionally set to cover-up a savage murder. Had the killer managed to destroy all the evidence or was there a clue he overlooked?

When a loving mother is found gunned down just steps from her front door, police in her small town are baffled. And as the investigation unfolded that sense of confusion would quickly boil into outrage.

A teenage couple out on a date are ambushed by a gun-wielding madman; the lone survivor's heartbreaking account may hold the key to bringing a cold-blooded killer to justice.

A woman and her teenage daughter are savagely murdered in their own home; police find clues at the crime scene, including a bloody bare footprint and an unharmed 3-year-old girl with a heartbreaking story.

When a young woman is found shot to death in her home, police are baffled; then a cryptic letter from a mysterious source sends the investigation down a twisting road to the truth.

A college student disappears in broad daylight after an afternoon of sunbathing at a busy lake. The mystery deepens when her wallet is found along with the personal items of the victim of another violent crime.

When a young woman disappears on a cold night in Breckenridge Colorado, one of the state's darkest mysteries begins.

Two girls take a trip to the mall and never come home; less than 24 hours later they are found shot to death in a desolate field; investigators ask whether they were killed by someone they knew or a notorious serial killer.

An elected community official is found stabbed to death in his Washington, D.C., home.

Three terrifying murders are connected together by one common thread. After years of frustration and heartbreak, can investigators from three states work together to find the deadly predator responsible for all the crimes?

When a young woman is savagely murdered in her own home, police and her family must find the clue hidden inside the blood-stained crime scene that will lead them to her killer.