Two days after shooting cabdriver Paul Stine dead in San Francisco, the Zodiac Killer sent the San Francisco Chronicle a taunting letter dated October 13, 1969. Inside was a torn piece of Stine’s bloodstained shirt, offered as proof the killer was the same man terrorising the Bay Area, not a copycat.
The letter mocked police for failing to catch him despite patrols flooding the area that night, and promised more killings to come. It remains one of several pieces of physical evidence tied to an identity that, more than fifty years on, has never been conclusively proven.
