51 years ago, the Zodiac sent his now-infamous "340 Cipher," a clue which became one of the most baffling mysteries in true crime cryptography. Many people claimed they had solved the cipher, but their solutions were not valid. Now, decades after the killer sent this hidden message, the Zodiac's "340 Cipher" has finally been solved by computer programmers Jarl Van Eycke, Sam Blake, and David Oranchak of ZodiacKillerCiphers.com. Listen to the incredible story behind the solution in this special episode of the ZODIAC: A TO Z podcast titled The Zodiac's 340 Cipher: Mystery Solved.

Note to the listener: Actor John Knight reads the Zodiac's newly-discovered message at the 19:45 mark.

Watch David Oranchak's YouTube video series "Let's Crack Zodiac" with more details about the methods used to discover the new solution.: