True-crime author Robert Graysmith wrote two books on the Zodiak (1986’s Zodiac and 2002’s Zodiac Unmasked). Like the movie, he pointed to a man named Arthur Leigh Allen as the most likely suspect. Allen died in 1992.
How the case was solved
The Case Breakers say they broke the case through years of digging through and analyzing evidence. And the latest batch they reviewed was forensic evidence and photos from Poste’s own darkroom.
They point specifically to a photo featuring scars on Poste’s forehead. And these forehead lines closely match wrinkles/scars on a sketch of the Zodiac.
The Zodiac Killer taunted police, and the public with strange messages and ciphers sent to the local newspaper. In them, he claimed up to 37 victims.
The Case Breakers focused on deciphering specific letters and ciphers sent by the Zodiac that revealed him as the killer, said Jen Bucholtz, a former Army counterintelligence agent. In one note, the letters of Poste’s full name were removed to reveal an alternate message, Bucholtz explains.
