Most impactful documentary series about unsolved cases

While the first part is older, the release of Part Two in 2024/2025 makes this series highly current and impactful. It's a landmark true crime documentary known for its shocking revelations and direct impact on legal proceedings.

This recent series brings renewed attention to a pivotal 1982 case that changed over-the-counter medication safety. It highlights the enduring mystery of the cyanide-laced Tylenol and the killer who was never caught.

This 2025 documentary investigates a complex case with ongoing developments and conflicting accounts. It keeps the audience engaged in the unsolved aspects of the truth surrounding Jason Corbett's death.

This series brings new attention to a long-standing cold case, revealing previously unreleased leads. It offers a fresh perspective on the Bradley family's enduring quest for answers regarding Amy's disappearance.

This very recent and important series addresses a critical, often overlooked, societal issue with many unsolved cases. It offers investigative journalism at its best and gives a voice to marginalized communities.

This recent documentary uses modern forensic advancements to shed new light on a cold case. It offers both resolutions for some families and lingering questions about the full scope of the crimes.

Despite its 2020 release, the case remains unsolved, and the documentary's deeply personal and intricate investigation into family secrets makes it a continuously impactful series about an enduring cold case.

The series continues to release new episodes featuring current unsolved cases and has a history of helping to solve cold cases. This makes it a continuously impactful platform for unsolved mysteries.

Released in late 2024, this very recent and impactful series highlights the perseverance required to solve long-standing cold cases. It showcases how a mother's search for truth can lead to resolution decades later.

This long-running and continuously updated series directly addresses unsolved cases, showcasing how modern techniques and persistent investigation can bring justice decades later. Recent marathons and episodes ensure its currency.

As a new release in 2026, it offers a fresh look at a gripping cold case from Scotland. It reflects on violence against women and the enduring mystery of Arlene Fraser's disappearance.

This very recent release delves into a unique and impactful case with elements that remain unexplained. It explores the haunting final flight and the broader implications of mental health.

A brand new series in April 2026, it presents a deeply disturbing and complex unsolved mystery with conflicting narratives. It highlights a desperate search for the truth amidst small-town rumors.

As a 2025 release, it provides a current examination of a classic cold case that continues to fascinate and challenge investigators. The identity of the Zodiac Killer remains one of America's most enduring unsolved mysteries.