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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