In 2018, two paralegals were shot dead whilst at work in Scottsdale, Arizona. Four more victims were linked to the killing - who was the serial killer?

In 2001, a young couple were brutally assaulted in Salisbury, Wiltshire. Over a decade later, new DNA technology helped lead investigators to the attacker.

Fort Worth Texas 1974. 17-year old Carla Walker is kissing her boyfriend Rodney in his car when suddenly the door is ripped open by an unknown assailant.

High school student Kim Bryant is last seen outside a Dairy Queen restaurant. Three weeks later, her body is discovered by three teenage boys hiking on the outskirts of town.

On the morning of September 4th, 1981, mom of two, Linda Slaten was found murdered in her bedroom in her Lakeland Florida apartment.

Arapahoe County, Colorado, 1983. The body of Sylvia Quayle is discovered by her distraught father in her Cherry Hills home.

Las Vegas, Nevada, June 1 1989. Stephanie Isaacson sets off on her morning walk to school; she never makes it.

March 6 1959. 9-year-old Candy Rogers leaves home to sell girl scout mints in Spokane Washington, she never returns.

October 9 1980, Santee, San Diego. The neighbours of 20 year old college student Michelle Wyatt hear screams coming from her condo but fail to investigate.

A fugitive has at least 9 victims known to police over the course of 15 years. They had his DNA even, but still no suspect. That is until new advances in familial DNA is compared 27 years after the first known attack in 1991.

In the summer of 1976, the body of 16-year-old Carol Sue Klaber is found in a roadside ditch in Kentucky. Fast forward to 2022, cutting-edge DNA science is employed to finally name her killer.

In July 1987, Donna Hyatt's daughter finds her mother brutally murdered at home in Carlsbad, New Mexico. Donna Sue Hyatt's murder is unsolved for decades until modern forensic science catches up.

In 2003, the skeletal remains of a young woman are found.

When the body of a young woman is discovered in 1970, her family never loses hope that one day her killer will be identified; after 52 years, genetic genealogy provides the truth.

Dade County police in Georgia work to uncover the identity of a Jane Doe and locate the perpetrator responsible for her murder.

In 1968, the remains of an unidentified woman are discovered; detectives work for nearly half a century to identify the Jane Doe and the murderer who evaded law enforcement for 50 years.

In 1964, the body of a young girl is discovered in Hazleton, Pa. The community lives in fear that a child predator is hiding in plain sight. Over 50 years later, the truth is finally revealed.

Two unsolved murders from the late 1970s near Tahoe, Calif., stump investigators for decades.

40 years after the sexual assault and murder of 20-year-old Robin Brooks in Sacramento, California, determined cold case detectives collaborate with scientists using revolutionary forensic techniques to put her killer behind bars.

Cutting-edge DNA science finally names the Phoenix Canal Killer who terrorized the city in the early 90s.

Investigative genetic genealogy is used to resolve the 1988 murder of a mother killed in front of her toddler

Investigative genetic genealogy reveals the killer of a young mother murdered in her own home 34 years prior.

A young woman is found beaten, raped and strangled in Garden Grove, California in 1987. Two years pass until a woman in a neighboring jurisdiction meets the same fate. It will take years before forensics identify this serial killer.

In 1990 Mississippi, a woman is kidnapped at knife-point. Police are unable to identify the perpetrator. It'll take forward-thinking investigators, state-of-the-art science and brave survivors to put this man behind bars.

DNA science unveils a predator who sexually assaulted a 20-year-old before shooting her in Washington in 1972.