Ten years after a 17-year-old girl is found strangled in the woods in small-town Kentucky, detectives uncover a terrible family secret.

The case of a gruesome stabbing death of a bullied teenager remains unsolved for 27 years.

One family faces two unsolved murders of loved ones and authorities finally uncover the missing clue that leads to solve the case 13 years after the murders occurred.

The death of an elderly couple, Edward "Ed" and Wilhelmina "Minnie" Maurin Ed in Washington state on Christmas Eve 1985.

In July of 1970, the brutal murder of single mom 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 high school friend to help her find justice for Loretta.

In early 1984, three-year-old Vanessa Bennett becomes the lone survivor of her family's brutal murder. Initial investigators suspect a serial killer is at large, but decades pass before DNA narrows the suspect pool to one man.

When 13-year-old Jennifer Bastian is abducted and murdered in August of 1986, residents of Tacoma panic. This is the second young girl killed in five months. Convinced a predator is loose, police embark on a 32-year inquiry.

13 days 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, but the truth is decades away.

23-year-old teacher Irene Garza was a former beauty queen and devout Catholic who vanished the evening before Easter after giving confession. Residents of her close-knit border town did their best to find her, but after a series of false leads, her body was found floating in a drainage canal clearly the victim of a violent sexual predator. At the time, a key witness hinted that a member of the Catholic clergy may have been responsible, but the clue remained buried for 42 years until a former priest comes forward with a damning confession from another man of the cloth that reveals a sinister coverup.

A fire in January 2007 in Canton, OH, claims the life of WWII vet Bennie Angelo; a closer look at the crime scene reveals Bennie was dead before the fire, bumping an arson case up to homicide.

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.

Janie Landers disappeared in 1979 from the home for the impaired and later on, her body was found. It took years before the suspect was found and the horrors in the facility are uncovered.

In the 1980s, a suspected serial killer preyed on women in small towns located on the banks of the Mississippi River until the murders abruptly ceased and went unsolved. In 2006, 26 years later, a cold case detective and producer on the set of "Cold Case Files" unknowingly began to connect the dots that would crack the case while discussing the murder of Deborah Sheppard, a Southern Illinois University student whose death had remained a mystery since 1982.

When a beloved schoolteacher is found murdered in her Neptune, New Jersey apartment in the fall of 2009, 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.

When 23-year-old Tonya McKinley is found brutally murdered on New Years 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.

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.

College student Brad Perry shows up to work his graveyard shift at the gas station and is never seen alive again.

When Gary Parks is killed in a fire-ruled arson, the investigation into his death shifts to homicide.

When 19-year-old Tara Sidarovich goes missing from her Punta Gorda home, Florida police consider her a runaway; then her body turns up in a swamp. Shocking prison recordings will send detectives on a nationwide hunt for her killer.

A 2007 cold case resurfaces when a detective reopens the investigation into the brutal killing of Audrey Giannotti, 20, in rural Pennsylvania. Uncovering hidden secrets, he races against time to bring justice to a family desperate for answers.

Near what's known as the hanging tree, the mutilated body of Timothy Coggins is found in late 1983. The investigation is thwarted and the case freezes for over 30 years, until a newly elected sheriff vows to bring the killers to justice.

Easter Sunday of 1992, the body of missing woman Lisa Ziegert is found in a field. The investigation yields hundreds of leads but no true suspect. After more than two decades on ice, the case is revived when DNA phenotyping puts a face to the killer.

Just two years into their marriage, Chuck and Cheryl Hall are torn apart when Cheryl is murdered. Though Cheryl's family is certain they know her killer, the law isn't as sure. After several decades, a DNA match erases all doubt.

When a 30-year-old mother fails to report for duty in Virginia, the Army lists her as AWOL. Her family immediately suspect foul play. They embark on a 13-year quest for answers before an eyewitness blows the case wide open.

When Susan Schwarz is found shot to death in her apartment in 1979, police suspect a robbery gone wrong. Thirty-two years pass before a witness reveals a much darker motive that breaks the case wide open and leads to Susan's killer.

A massive search unfolds in Chandler, OK, when two women and a child go missing from a Walmart parking lot in 1992. It will take 23 years and a tip from an unlikely source to piece together a heinous plot of misdirection and murder.

When the body of a woman turns up in a field in Huntington Beach, CA in 1968, police simultaneously seek a killer and the identity of the victim herself. It takes 52 years for detectives to solve this dual mystery and expose a vicious predator.

In 2002, Chris Green, 19, is found beaten to death in a ditch in Michigan. The case remains cold for nearly a decade until investigators uncover a suspect whose incriminating statements blow the case wide open.

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

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.

A woman's promise to bring her missing aunt back home unexpectedly took a lifetime.

In 1977, Florida nurse Deborah Clark, 23, is found brutally slain in her home; detectives unearth an affair, a jilted wife, and a web of money and power, but no true suspect. It will take 40 years and advanced DNA testing to expose her killer.

When beloved mother and sister Janora Stevens is found brutally stabbed in her Tulsa, OK, home, her family is bitterly divided and increasingly suspicious of each other. The case chills until a trail of tell-tale fibers leads cops to her 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 skull fractures point to murder; but it will be decades before investigators can find his killer.

When 31-year-old real estate appraiser Mike Williams mysteriously vanishes while duck hunting in the Florida swamps in December of 2000, authorities suspect he accidentally drowned. For sixteen years Mike’s disappearance remains a mystery. The case heats up when police receive a distress call from the victim’s wife in 2016. Featuring interviews with detectives and the victim’s mother as well as rare footage of the crime scene and recorded audio confessions with the accused, the episode explores how the disappearance unfolded into a sinister plot to cash in on millions of dollars of life insurance.

On a bitter morning in 1980, radio intern Helene Pruszynski is found brutalized in a snowy field. After 37 years of fruitless leads, investigators tap into a public genealogy website that leads them across the country to the killer they've been hunting.