Decades after he terrified citizens with his shocking crimes and bizarre letters, the Zodiac is known as one of the most enigmatic serial killers in modern history. His motives are unknown, although many people have offered various theories to explain his behavior. Attempts to create a psychological profile often rely on speculation based on our knowledge of other killers, and experts struggle to comprehend the mind of the Zodiac. This episode examines various theories about the killer’s motives and personality. Written and produced by Michael Butterfield for ZodiacKillerFacts.com / Copyright 2021 Voice of "The Zodiac" by John Knight This episode includes dramatic readings. All music licensed and used by permission. “Run and Hide” and “Frozen Orb” composed and produced by Jens Kiilstofte. “Ghost” and “Creepy Piano Loop” composed and produced by JM Scherf. “Growing Shadows” created by Myuu. Provided by Mediacharge.