A man standing in the darkness wearing a hoodie.

The Zodiac Killer: Case Closed airs Thursday 1 March on Crime and Investigation (DStv Channel 170) and DStv Now at 20:50.

Stream this intriguing documentary on DStv Now, The Zodiac Killer: Case Closed.  Pick and choose your favourite true-life horror cases in the True Crime Documentaries playlist

America’s most vicious serial killer, The Zodiac, terrorised San Francisco in the late 1960s. The Zodiac killed five men and women, then left bizarre ciphers as breadcrumbs.

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Although studied by the most advanced criminal justice experts of the time, only 25% of his ciphers were ever decoded. Now, Sal LaBarbera - the most successful homicide detective in LAPD history - will work with a crack code-breaking team to hunt down The Zodiac. The key: a groundbreaking new investigative technique called a Double Helix Investigation.

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Working with UCLA master codebreaker Kevin Knight, they’ll take a novel approach to catching The Zodiac.

The Zodiac Killer: Case Closed airs Thursday 1 March on Crime and Investigation (DStv Channel 170) and DStv Now at 20:50.

Visit the True Crime Documentaries playlist for more real-life horror cases.