The Vallejo Police Chief was quoted as saying, "We're not satisfied that the letter was written by the murderer," and he then asked the writer send another letter with more detailed information to prove that it was indeed him. While the threatened murders didn’t actually happen, all three parts of the letters sent to the media were eventually published. Then on August 7, 1969, The San Francisco Examiner received another letter stating, "Dear Editor This is the Zodiac speaking." This was the first time the killer had used this name to identify himself. It was a response to the Police Chief’s request for more details that would prove he had killed Betty Lou, Darlene and David. In the letter, the Zodiac Killer included details about the murders which had not been released to the public, and also a message to the police that when they cracked his code, they would know who he was.
At first no one could break the code. When the ciphers first came to police attention, Navy cryptographers were asked to attempt to break the code, but were not successful, including the FBI. Finally, a high school teacher in California sat down with his wife over the weekend and broke the code. Working at their kitchen table Donald and Bettye Harden unlock the secrets of the cyphers. Unfortunately, the cipher did not contain the Zodiac’s identity as he had said it would, but rather an explanation of why he killed. No names appeared in the decoded text, and the killer said that he would not give away his identity because it would slow down or stop his slave collection.
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