Zodiac Killer Final Episode: The Remaining Suspects, The Failed Investigation, and Why the Case Is Still Unsolved

In the final episode of our Zodiac Killer series, we move beyond the best-known suspects and examine the bigger question at the heart of this case: why has the Zodiac investigation produced so many names, and yet no definitive answer?

This episode covers the remaining major suspects, including Jack Tarrance, Rick Marshall, Ted Kaczynski, David Carpenter, Bruce Davis, Paul Doerr, Kjell Qvale, and Giuseppe Bevilacqua. For each, we look at why they were considered, what evidence or theory linked them to the case, and why none of those theories has led to a confirmed identification.

But this is not just another suspects episode. It is also a deeper look at the Zodiac investigation itself: the fragmented police response across multiple jurisdictions, the missed opportunities, the Paul Stine dispatcher error, the role of Dave Toschi and other investigators, the limitations of eyewitness sketches, the problems with the DNA evidence, and the enduring influence of the Zodiac’s letters and ciphers.

We also examine how modern forensic tools, including touch DNA, next-generation sequencing, and genetic genealogy, may still offer hope — while being honest about the limits of the evidence that remains. The episode explores the 2020 cracking of the Z340 cipher, the unsolved Z13 and Z32 messages, and the reality that the Zodiac case remains open more than half a century later.

Above all, this episode brings the focus back to the confirmed victims: David Faraday, Betty Lou Jensen, Darlene Ferrin, Cecelia Shepard, and Paul Stine. Their lives, not the mythology of the killer, are where this story begins and ends.

This is the final scripted episode in our Zodiac series — a careful, unsensational look at the remaining suspects, the failures and frustrations of the investigation, and the uncomfortable truth that some cases remain unsolved.

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About Crime Time Inc.

Season 5 of Crime Time Inc. broadens its reach across two sides of the Atlantic.

This season features cases from Scotland and across the wider UK — rooted in real investigative experience — alongside deep dives into some of the most infamous murder cases in American history.

Hosted by former detectives Simon and Tom, with experience in both the UK and the United States, including time working alongside the FBI, the show strips away sensationalism to explain how crime and justice really work.

Two crime worlds. One podcast.

New episodes released regularly throughout the season.

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