Bloodline Detectives focuses on familial DNA investigation, a search technique which uses genetic material from relatives to track down a suspect to solve violent crimes. Each episode shows detectives from all over the world solving cold cases by using the DNA of family members and how that additional DNA information is revolutionising genetic profiling to solve criminal cases.

Season 4 Episode 1 - The Norcal Rapist

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. Air Date : 30th-Sep-2023  Read More

Season 4 Episode 2 - Horror by the Roadside

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. Air Date : 7th-Oct-2023  Read More

Season 4 Episode 3 - Murder on Elm Street

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. Air Date : 14th-Oct-2023  Read More

Season 4 Episode 4 - The Mammoth Lakes Murder

In 2003, the skeletal remains of a young woman are found. Air Date : 21st-Oct-2023  Read More

Season 4 Episode 5 - The Court Reporter Murder

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. Air Date : 28th-Oct-2023  Read More

Season 4 Episode 6 - Murder by I-59

Dade County police in Georgia work to uncover the identity of a Jane Doe and locate the perpetrator responsible for her murder. Air Date : 4th-Nov-2023  Read More

Season 4 Episode 7 - The Huntington Beach Body

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. Air Date : 11th-Nov-2023  Read More

Season 4 Episode 8 - The Murder of Little Marise

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. Air Date : 18th-Nov-2023  Read More

Season 4 Episode 9 - The South Lake Tahoe Strangler

Two unsolved murders from the late 1970s near Tahoe, Calif., stump investigators for decades. Air Date : 25th-Nov-2023  Read More

Season 4 Episode 10 - Stabbing in Sacramento

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. Air Date : 16th-Dec-2023  Read More

Season 4 Episode 11 - The Phoenix Canal Killer

Cutting-edge DNA science finally names the Phoenix Canal Killer who terrorized the city in the early 90s. Air Date : 1st-Apr-2024  Read More

Season 4 Episode 12 - Mommy Has Been Murdered

Investigative genetic genealogy is used to resolve the 1988 murder of a mother killed in front of her toddler Air Date : 1st-Apr-2024  Read More

Season 4 Episode 13 - The Three Rivers Killer

Investigative genetic genealogy reveals the killer of a young mother murdered in her own home 34 years prior. Air Date : 1st-Apr-2024  Read More

Season 4 Episode 14 - Double Homicide in the OC

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. Air Date : 1st-Apr-2024  Read More

Season 4 Episode 15 - The Mississippi Rapist

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. Air Date : 1st-Apr-2024  Read More

Season 4 Episode 16 - Justice Delayed

DNA science unveils a predator who sexually assaulted a 20-year-old before shooting her in Washington in 1972. Air Date : 1st-Apr-2024  Read More

Season 4 Episode 17 - Murder in Apartment 101

In Willoughby, Ohio, Mark Madger comes home to find his wife Nadine lying in a pool of her own blood, stabbed to death. Four decades later, cutting-edge DNA science provides answers the Madger family have been waiting a lifetime for. Air Date : 1st-Apr-2024  Read More

Season 4 Episode 18 - Carrie's Courage

A woman who was sexually assaulted at gunpoint in the 1980s contacts a genetic genealogist to solve her case. Air Date : 1st-Apr-2024  Read More

Season 4 Episode 19 - The Sadistic Killer

Investigative genetic genealogy unmasks the sexual deviant who raped and killed Christina Castiglione in 1983 Air Date : 1st-Apr-2024  Read More

Season 4 Episode 20 - Murder in Marietta

The 1972 rape and murder of 9-year-old Debbie Lynn Randall is solved thanks to new science 50 years later. Air Date : 1st-Apr-2024  Read More