These letters were signed under the code name.

Zodiac killer biography. The zodiac killer or simply zodiac or the zodiac is the pseudonym of an american serial killer who operated in northern california from at least the late 1960s to the early 1970s. He taunted police and made threats. The killer originated the name in a series of taunting letters and cards sent to the san francisco bay area press. The zodiac killer was a serial killer active from the late 1960s to the early 70s in northern california usa.

The case inspired the 1971 film dirty harry which starred clint eastwood and it was the subject of the critically acclaimed david fincher drama zodiac 2007. The name zodiac originated from a number of letters written by the killer to the local press. These letters included four cryptograms or ciphers.

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