Exploring the Military Influence on the Zodiac Killer's Knowledge of Ciphers

Writer and researcher Michael Butterfield joins retired FBI profiler Julia Cowley to answer listener questions about the Zodiac Killer case.

Michael is the host of the podcast Zodiac: A to Z and the author of the new book The Zodiac Killer: The Story of America's Most Elusive Murderer.

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Music “Light in the Basement” by John Hanske. Listen to more of John’s music on Spotify.

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