When a beloved schoolteacher is found murdered in her apartment suspicion is cast on her soon-to-be ex-husband. Long after the case goes cold, a detective embarks on a mission to help the man clear his name and track down the real killers

Almost two weeks after Pam Pitts disappears in 1988, her charred body is found at a popular hangout spot in the Arizona desert. When a second victim is discovered in a mineshaft, detectives suspect the killer may have known them both

When 23-year-old Tonya McKinley is found brutally murdered on New Year's Day 1985, a little boy is left motherless. A family must wait 35 years for advancements in forensic science to finally catch a killer using familial DNA.

In March 1984, Jack Kennedy discovers his daughters brutally murdered. Their mother and niece spend their lives keeping the case alive, but DNA leads nowhere. Thirty years later, an informant gives up a name, but the family's ordeal is far from over.

In 1997 the brutal murder of 19-year-old Tiffany Johnston rocks the small town of Bethany, Oklahoma. DNA points to her killer over a decade later and leads investigators across state lines to Texas, to the buried bodies of two other missing women.

In July 1970, the brutal murder of single mum Loretta Jones leaves four-year-old Heidi Jones motherless. Nearly 40 years later, Heidi vows to solve her mother's cold case and calls on an old school friend for help.

When a deadly house fire claims the life of a family in rural Oklahoma, investigators suspect foul play and it sends a mother on a decades-long crusade to find out what happened to her missing teenage daughter and best friend.

In June 1985, a 20-year-old Festival Queen is found brutalised. The small community of Nixa, Missouri, is certain her blood is on the hands of a local wealthy businessman, but after 25 years DNA reveals the true killer.

In December 1985, when human bones are discovered in the woods, it puts an end to the search for missing teen David Reed. David's disappearance shook a small town, but it will be decades before investigators can find his killer.

When firefighter Gary Parks is killed in a fire ruled arson, the investigation into his death shifts to homicide. A serial arsonist is thought to be the culprit, but it will take a cold-case detective following his gut to track down the real killer.