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In the late 1960s, a mysterious killer began terrorizing Northern California. But what made this case different… was that the killer didn’t just commit crimes. He wrote letters. Letters sent directly to newspapers… letters filled with threats, codes, and chilling messages. At the end of every letter, he signed with a strange symbol — a circle with a cross. And one terrifying line: “This is the Zodiac speaking.” The first known attack linked to the Zodiac happened on December 20, 1968. A