Almost certainly one and the same, this prowler had been calling Daniel Williams' residence from October 23rd 1969 to November 2nd 1969, which culminated in his pursuer lacing his 7-Up soft drink with more than enough arsenic to kill. Police had been summoned to his residence on November 2nd 1969 when he noticed the screen door of his house had been pried open, however, they left shortly thereafter when it was determined nothing had been stolen. A short time later, Daniel Williams went to his refrigerator for some light refreshment and took a swig of 7-Up. Had he swallowed after noticing the metallic tasting drink, he most certainly would have died alone on his kitchen floor. The person who called Daniel Williams on numerous occasions threatening his murder claimed to be none other than the Zodiac Killer. Somebody pretending to be the Zodiac Killer by phone or mail is one thing, but this person had intended to kill.
If Daniel Williams had a hidden enemy with a grudge, not only was he apparently unaware of this animosity toward him, but why would this person telegraph his intent over a two week period by way of malicious phone calls. The notion of somebody attempting to kill the school teacher, while passing it off as a Zodiac crime over a prolonged period, appears a rather convoluted approach, when the perpetrator could simply have killed Daniel Williams and then made a phone call or mailed a letter taking responsibility as the Zodiac Killer. Ringing a police department and making threats to kill, in advance of comitting the act, seems to negate the opportunity of surprise and allows the intended victim to take preparatory steps. When we consider the contents of the November 8th and 9th communications by the Zodiac Killer, only three days after the phone call to the Martinez Police Department on November 5th 1969, another possibility begins to materialize.
The persistence of this stalker may not have stopped on November 5th 1969, when the Zodiac Killer's Dripping Pen card arrived at the San Francisco Chronicle, stating "I though you would nead a good laugh before you hear the bad news. You won't get the news for a while yet". This phrase had all the hallmarks of activity ongoing, which had yet to reach its conclusion, backed up by the letter which arrived at the Chronicle the following day. In the Bus Bomb letter mailed on November 9th 1969, the Zodiac Killer made obvious that his victim count was only totalled "up to the end of Oct", suggestive of ongoing action between October 31st 1969 and the current mailing date. This apparent desire to add an eighth victim to his total, in light of a man claiming to be the Zodiac Killer and ringing the Martinez Police Department on November 5th 1969 with the threat of murder, appeared to indicate he was not finished yet. Or at the very least, this is what he wanted us to believe.
The nature of the attack on Daniel Williams by way of arsenic poisoning, seemed to fit with the opening paragraph of the November 9th 1969 letter, in which the Zodiac Killer vented his frustration and promised to alter his approach to murder. He directly addressed law enforcement, remarking that "I have grown rather angry with the police for their telling lies about me. So I shall change the way the collecting of slaves. I shall no longer announce to anyone. When I committ my murders, they shall look like routine robberies, killings of anger, + a few fake accidents, etc". However, it's what he said next that may link the Zodiac Killer to the malicious phone calls perpetrated on Daniel Williams. The caller to 1234 Bush Street claimed he was thwarted by police outside a Martinez school during his search for victims, but they wouldn't catch him because, as he stated “I’m too smart for them". The next line of the Bus Bomb letter, after promising to change his way of collecting slaves, was to ridicule police by asserting that "The police shall never catch me, because I have been too clever for them". This could be argued as the Zodiac Killer reading the newspapers and mimicking the wording in the written text to plant a seed of his involvement in the Daniel Williams stalking. If this was his intention, it was so subtle, it went ignored for 51 years. The police probably believed this prolonged attack on Daniel Williams was just another successor in a long line of Zodiac hoaxers, but this supposed hoaxer was not only determined, he was prepared to kill to imitate the Zodiac Killer.