PITTSBURGH (KDKA) — A new book just out on California’s infamous Zodiac Killer is on the New York Times Bestseller List.

The book is titled “The Most Dangerous Animal of All.” And a former Pittsburgher, now a forensic document examiner, was involved in an important part of the book’s research.

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The book’s authors are Gary Stewart and Susan Mustafa.

Stewart believes his father, Earl Van Best, Jr., was the Zodiac murderer.

Stewart got a mug shot of his father from San Francisco Police when he learned that his dad had a criminal record there.

There’s a remarkable likeness between a composite of Zodiac and a police mug shot of Van Best.

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No one has ever been charged or arrested in the Zodiac killings, which mostly occurred around the San Francisco Bay area in the late-60’s and early-70’s.

Zodiac bragged that he had been involved in more than 30 killings.

For their part, police have said he was responsible about half a dozen.

Zodiac would send cryptic messages during his killing spree, saying things like he would pick off little kiddies on a school bus, and if investigators could dissect one of his cryptograms, they could learn, in advance, where he had hidden a bomb.

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