| Theories
that have been advanced in this case include:
1. Arthur Leigh Allen. Allen was the prime
suspect of the police in 1969 on the basis of an eye witness.
Survivor Michael Mageau identified Allen as the man
who shot him from a picture on his 1968 driver's license.
However, since his fingerprints did not match
those taken from Stine's taxi cab , no charges were ever
filed against him. In 2002, his DNA was tested but
did not match the DNA found on the envelopes of the letters,
2.
The Invention Theory. According to this theory,
the Zodiac was a construct. A policeman with access to the
unpublished details of the first two attacks, wrote the
letters to the newspapers inventing "the Zodiac."
He may simply have wanted to link these two cases.
The publicity then provoked a copycat killer to wear a Zodiac
costume and attack the couple at the lake, and also the
taxi-driver. This would why the evidence from the different
crime scenes did not match a single suspect.
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