It was November 2nd 1969 when Daniel Williams received the final call from the man presumably impersonating the Zodiac Killer, with the menacing threat of “You’re the dead duck". He would then leave his house in Martinez and return later, only to find his screen door pried open and arsenic in his soft drink. Fortunately for Daniel Williams he noticed the metallic taste and spat it out, which undoubtedly saved his life. Clearly the murder of Daniel Williams had been thwarted, meaning the perpetrator had unfinished business. This is why I find the Zodiac Killer's opening statement in the Bus Bomb letter particularly unusual. The opening line of the November 9th 1969 communication began "This is the Zodiac speaking up to the end of Oct I have killed 7 people". But why didn't he just declare "This is the Zodiac speaking. I have killed 7 people to date", or "This is the Zodiac speaking. I have murdered 7 people". He deliberately chose to say "up to the end of Oct", almost like there was a murder he was still engineering or was attempting to complete between the end of October and November 9th 1969. In other words, he had unfinished business. Bearing in mind the murder attempt on Daniel Williams took place on November 2nd 1969, he may have been signalling by the statement of "up to the end of Oct" that he wasn't finished with Daniel Williams just yet. Especially when we consider that just a few lines later he issued the statement of "The police shall never catch me, because I have been too clever for them", in extremely similar fashion to “I’m too smart for them" spoken over the phone to Daniel Williams.
The wording of "I though you would nead a good laugh before you hear the bad news". appears to indicate that the Zodiac Killer has, or is actively seeking to generate some bad news - which would usually involve murder. He then qualifies this statement by adding "You won't get the news for a while yet". This could indicate that he had plans for murder, but was yet to complete his mission. If he was the caller and poisoner of Daniel Williams, his failed murder attempt may have inspired the statement of "up to the end of Oct" and "You won't get the news for a while yet" in reference to his continued pursuit of the Richmond school teacher. Ironically, the Dripping Pen card would be accompanied by the Zodiac Killer's second lengthy cryptogram, the first of which was cracked by a Salinas High School teacher.
RELEVANT ARTICLES: THE PROMISE OF MURDER ON LINE 5 A KILLER ON LINE FIVE