Zodiac Case: Every Suspect That Was Seriously Considered

10. Robert Tarbox's Mystery Suspect

Why not kick off an investigation into an unsolved serial killer with an unnamed suspect?

The most mysterious revelation in the Zodiac case came in 2009, when retired lawyer Robert Tarbox alleged that his office was visited by a man claiming to be the Zodiac back in 1975.

The potential killer came to Tarbox seeking legal advice after he had confessed comprehensively to the infamous crimes. Tarbox claims that this man's profession was of a merchant mariner; apparently the lifestyle of a mariner is said to fit the suspect profile built by police. This lends further credence to Tarbox's tale.

If true, it means that one of the most wanted murders in history may, at some point, have wanted to own up to his crimes. Unfortunately, life imprisonment or the death penalty was not appealing, and so the suspect left Tarbox's office never to be seen or heard from again.

Tarbox only made this potential encounter public in 2009 in an effort to clear the name of other accused men that he believed to be unfairly hounded and, ultimately, innocent. Tarbox has since passed away, making any future identification impossible. Whether or not Tarbox actually encountered the real Zodiac Killer will remain a mystery.