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Jack Tarrance became a suspect when his stepson, Dennis Kaufman was watching a television profile of the Zodiac Case. Kaufman found many similarities between the Zodiac killer and Jack Tarrance. Tarrance also looked strikingly similar to the composite sketches of the Zodiac Killer. Dennis Kaufman also claims his stepfather confessed to being the Zodiac in a taped conversation in which Kaufman asks Tarrance if he is the Zodiac. The interpretation of Tarrance's response seems highly subjective to critics of Kaufman's claims.
Tarrance's handwriting, while not an absolute match, does look very much like that of the Zodiac killer. The most notable difference in the two exemplars is the formation of the lower-cased letter "a."
Kaufman's own personality and his less than professional presentation skills have made him the subject of much criticism in the Zodiac research community. This has affected his credibility among his peers, as well. Still, Jack Tarrance remains a subject of interest in the media. As of this writing, a motion picture is currently in the works.
Dennis Kaufman has gathered his evidence pointing to Jack Tarrance on his website. The site contains photographs, audio, and other documents pointing to Jack Tarrance as suspect. Kaufman has also authored a book, though it appears to be out of print.
Dennis Kaufman's website: http://therealzodiackiller.com/
