British director Charlie Shackleton was in Vallejo, California, where at least two of the murders committed by the Zodiac killer took place, when he discovered that a documentary that he planned to make on the subject would not be going ahead.

Shackleton had been planning to use The Zodiac Killer Cover-Up: The Silenced Badge , written by California highway patrol officer Lyndon Lafferty, as his source material for a true-crime documentary about the infamous murderer.

“I had foolishly gone way beyond what any sensible documentary filmmaker would do while still in development and had structured the film, mapping out so many of the sequences,” he told Deadline. “I couldn’t help kind of sculpting the thing in my mind. Then I happened to be in San Francisco for a screening of another film

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