The Zodiac Killer case is one of America’s great murder mysteries. He terrorized San Francisco between 1968 and 1969, killing at least five people, and continued to taunt the authorities with letters for years to come. His letters contained cryptograms, and three of them remain unsolved to this day.

The letter above is a scan, direct from the San Francisco police evidence files, of the June 26, 1970 letter that Zodiac sent to the San Francisco Chronicle. The cryptogram at the bottom has never been decoded. Cick the image to embiggen it.

On March 2nd Zodiac, David Fincher’s long-awaited movie about the case and the effect it had on the people obsessed with solving it, will finally be released. As part of the campaign to promote the film, Paramount has supplied us with the above scan and have launched a definitive timeline of the Zodiac case on the movie’s website, which you can see by clicking here.