Few unsolved cases have inspired as much fascination, speculation, and debate as the Zodiac killings.
For Dr. Mark G. Hewitt, that fascination became something much more.
Hewitt spent 11 years immersed in the Zodiac case, studying the crimes, the evidence, the letters, the suspects, and the questions that have remained unanswered for decades. In this video, he explores one of the most intriguing theories surrounding the case:
Could Ted Kaczynski—the Unabomber—have been the Zodiac Killer?
Watch the video below as Hewitt lays out his case and examines the connections that led him to take the possibility seriously.
Go Deeper Into the Zodiac Case
If the video leaves you wanting to know more about Hewitt’s investigation—and the obsession that kept him searching for answers for more than a decade—his book, Obsessed: My Relentless Pursuit of the Zodiac Killer, takes readers behind that journey.
Part true-crime investigation and part personal story, Obsessed follows Hewitt’s transformation from someone intrigued by an infamous unsolved case into a researcher determined to understand who the Zodiac was and whether the mystery could finally be solved.
Ready to go down the rabbit hole?


