The Zodiac Killer was widely known for his letters, which, like Jack the Ripper, taunted the police and press. In his letters, as well as his phone calls, he admitted to killing several victims. In a few letters, he even provided a piece of Paul Stine's blood-stained shirt to prove he was the murderer.
Just To Note...
1/3 Cipher Included (July 31, 1969)
Desktop Poem (April 1967)
Introduction to the Name the "Zodiac"
Mt. Diablo Letter (1970)
Riverside Activity Letter
The Confession (November 29, 1966)