As the Zodiac case intensified in late 1969, local police and the FBI joined forces in a desperate bid to catch a killer who thrived on fear. This episode dives into early profiling by John Douglas, the rise and fall of prime suspect Arthur Leigh Allen, and the growing list of alternate suspects. We also explore major breakthroughs—from the 340 cipher crack to DNA and genealogy efforts—that continue to push the investigation forward.
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