The Zodiac Killer Much is unknown about the Zodiac killer, but given what is known about serial killers in general, this man was probably born between 1938 and 1943. That would make his age between 25 and 30 years old at the time of his first murder in Vallejo, California, in 1968. Also, that age estimate works with witness statements and it's supported by Zodiac's references to his victims in younger terms in his letters of 1969. Zodiac wasn't an attractive …showed first 75 words of 1222 total…

…showed last 75 words of 1222 total…Zodiac's own handwriting. Later on, the theory was that he was using samples of alphabet letters taken from other people. He then used a tracing and enlarging device to reprint them into a letter. This man was clever enough to throw off the police by coding of his letters. He often used astrological symbols and signs. If his intent was to frighten San Francisco, then he achieved his goals without a doubt. His name, Zodiac.