The mystery of the Zodiac killer
The Zodiac killer went on a serial killing spree between 1968 and 1972. The still unknown killer used taunting letters with cryptograms sent to the police and newspapers. The cryptograms were never decoded. The Zodiac killer set himself apart from other serial killers who only used one distinct method of killing. In some cases, he shot his victims, while in others he stabbed them. Despite identifying Arthur Leigh Allen as a suspect, the case went cold.
