On December 20th, 1969, a letter was mailed to Melvin Belli's residence at 1228 Montgomery Street in San Francisco, California (see attachments). The envelope also contained a piece of blood-soaked clothing. The author states in the first line, "Dear Melvin This is the Zodiac speaking." But was it a hoax? The police determined that the piece of bloody shirt material did indeed originate from the shirt worn by Paul Stine, the Zodiac Killer's last known...