Allen was cleared through a comparison of dna fingerprints palm prints and handwriting.

Zodiac killer suspects arthur allen. Robert graysmith s book zodiac advanced arthur leigh allen as a potential suspect based on circumstantial evidence. Allen became publicly known as a zodiac suspect shortly after the release of zodiac a book authored by robert graysmith. Allen had been interviewed by police from the early days of the zodiac investigations and was the subject of several search warrants over a 20 year period. The main reasoning behind this is that he was the named suspect in a best selling book on the murders which was then the basis of a hit movie.

Arthur leigh allen died on august 26 1992 at the age of 58 of a heart attack in his home in vallejo.

• Zodiac Killer Podcast