50 years ago, the Zodiac sent a greeting card with a cipher consisting of 340 symbols. Today, the cipher remains one of the most baffling clues in true crime history. In the next episode of the ZODIAC: A TO Z podcast, computer programmer and Zodiac cipher expert David Oranchak (ZodiacKillerCiphers.com) talks about the enduring mystery of the "Z340."

Written and produced by Michael Butterfield for ZodiacKillerFacts.com / Copyright 2019

Voice of "The Zodiac" by John Knight 

All music licensed and used by permission. “Run and Hide” composed and produced by Jens Kiilstofte. “Ghost” composed and produced by JM Scherf.