The question was; had the Zodiac already attempted or carried out a crime after the October 18th 1969 article that was designed to look accidental or natural, but had possibly failed. After all, his victim count remained at seven by the end of October, which he corroborated in the Dripping Pen Card on November 8th. To do so, we would have to look at attempted crimes claimed by the 'Zodiac Killer' between October 18th and November 8th, in a relevant location.
As seen on the left, a Salesian High School teacher, Daniel Williams had his house broken into, but nothing was taken. A man claiming to be the Zodiac Killer made several threatening phone calls beginning on October 23rd 1969, culminating with the caller saying "You're the dead duck" on November 2nd 1969. Later that day, Williams took a drink from the refrigerator, but fortunately spat it out after noticing a metallic taste. The drink contained enough arsenic to kill.
This in all likelihood is not the Zodiac Killer, however, the targeting of a school teacher is interesting, bearing in mind a Salinas High School teacher, Donald Harden cracked his first cipher, and his 'Dripping Pen' card and second cipher was to arrive in just six days. It could also be argued that this attempted murder - had it been successful - may have looked 'accidental' as the Zodiac would state in the 'Bus Bomb' letter.
Daniel Williams residence was situated at 1234 Bush Street, Martinez, only 9 miles from the location of Zodiac's first crime at Lake Herman Road.
The mystery man during one of his calls talked of "killing the lady in the blue house," but as of yet the meaning behind this utterance is undetermined.
Bearing in mind the October 22nd 1969 Jim Dunbar radio show, in which Zodiac was supposed to call in, it is hardly surprising we may get a crank call by somebody claiming to be Zodiac beginning on October 23rd 1969. The only difference here, was it appeared the caller was prepared to back up his threat with action. The original caller to the Oakland Police Department at 2:00 am on October 22nd 1969 may however, not be the same person as the hoaxer, who ultimately called the Jim Dunbar show and spoke to Melvin Belli.
The phrase 'dead duck' may originate from "Never waste powder on a dead duck," first recorded in 1829. Bearing in mind the use of arsenic powder, an ironic choice of words.