Police learn the key witness in the stabbing death of a beloved aunt was an imposter; a return to the crime scene reveals a clue hidden in plain sight.

Two unsolved murders of loved ones plague a family; detectives uncover a hidden crime scene that may help solve the 13-year-old cold case.

A 17-year-old girl from a small Kentucky town goes missing, then is found strangled two weeks later; a police investigation into the crime uncovers a terrible family secret.

When 18-year-old Shannon Siders' body is found in the woods, everyone in the small town of Newaygo, Michigan, becomes a suspect - but no one is convicted of the crime. It takes 22 years for a special cold case unit - along with the help of the entire town - to solve Shannon's murder.

The longest running cold case of a law enforcement officer in the United States was the murder of Sheriff's Lt. Joe Clark - shot execution style in his own home. Given his tough stance on drug crime, detectives become convinced his death is the beginning of a drug war. It takes 33 years for them to discover the truth.

College student Brad Perry shows up to work his graveyard shift at the gas station and is never seen alive again. It will take twenty years, the uncovering of an illegal drug ring in a squeaky-clean Mormon town, and the development of new forensic technology to solve this cold case.

A killer authors a book about his con-man past that becomes the key to solving a 29-year-old cold case of two high school sweethearts–and three other cold case murders–leading police to believe he could be the Zodiac Killer.

The case of a gruesome stabbing death of a bullied teenager remains unsolved for 27 years – until a rookie cold case detective sees a new clue in an old crime scene photo, leading her to a killer that everyone thought could not possibly have committed the crime.

A family torn apart by their grandparents' murders. Two decades later, a cold case detective takes on the case that has haunted him since he was a child. When he makes a big break in the case, he must race to solve it before the family takes matters into their own hands.

Halloween in a small town is cancelled indefinitely when a young girl is kidnapped and killed on her way home from a costume party. Ten years later, a detective's obsessive attention to detail exposes a shocking mistake that kept the case's most obvious suspects on the streets for 10 years.