The author of a new book says his dad is the infamous Zodiac killer.

An excerpt of the book in New York Magazine says Louisiana resident Gary Stewart discovered his father was the Zodiac after 12 years of research.

The revelation is laid out in "The Most Dangerous Animal of All," in which Stewart is searching for his biological father.

The Zodiac killer murdered at least five people in the Bay Area in the late '60s and despite more than 25-hundred tips was never captured.