Since this proclamation on November 9th 1969, the only tangible crimes linked to the Zodiac Killer appear to be the Modesto abduction of Kathleen Johns on March 22nd 1970 and the disappearance of Donna Lass from the Sahara Tahoe Hotel and Casino, Stateline, Nevada, on September 6th 1970.
The car was central to his plan in the Modesto abduction as the focus of attack, after all if Kathleen Johns story is to be believed, he could just as well have approached her car and started shooting. Possibly his aim was to conceal the crime from being associated with the previous Lake Herman Road murders and Blue Rock Springs attack and what he had in store for Kathleen Johns was ultimately thwarted. Her eventual escape from his clutches and her subsequent identification of him as the Zodiac Killer from the composite sketch at the Patterson Police Station, may have forced his hand and he reluctantly owned up to the crime a few months later. Unless of course he was laying claim to a crime he never committed.
Had the Zodiac Killer played a part in the disappearance of Donna Lass on September 6th 1970, possibly removed from the initial contact point at the casino to deflect attention away from the likely perpetrator. The only viable links to the Zodiac Killer have been drawn from the unauthenticated Pines Card mailed six months after the disappearance.
Isobel Watson (33) had just got off the bus on the evening of April 7th 1972 and was walking home along Pine Hill Road, Tamalpais Valley, Marin County at 9.00 pm, when a light colored vehicle veered towards her, knocking her to the ground. [view on google maps] The driver exited his vehicle offering to take her home, but after she had refused his offer of apparent help a second time, the concerned citizen suddenly transformed into a rage, pulling out a knife and stabbing the woman in the neck and shoulder. Her screams alerted the neighborhood, at which point the assailant made a hasty retreat from the scene.
She was treated at Marin General Hospital and fortunately survived the brutal attack. Her description of the man alerted investigators to a possible Zodiac connection, that of a man with heavy rimmed black glasses in his early 40's, 5' 9" in height and short brown hair. It was not overlooked by police that the killer had attempted to lure the woman into his vehicle, not dissimilar to the methods employed in the Modesto abduction of Kathleen Johns. We may never know the answer.
Napa County homicide detective Ken Narlow believed in a greater than 50-50 chance of a Zodiac connection, bearing in mind the description given by Isobel Watson and the fact that April 7th 1972 once more fell on a Friday. The Zodiac crimes of Lake Herman Road, Blue Rock Springs, Lake Berryessa and Presidio Heights were on Friday, Friday, Saturday and Saturday respectively.
There may be countless crimes associated to the Zodiac Killer that we are unaware of, if we believe his boasts of ME-37 SFPD 0 in the Exorcist Letter, but equally there may be none. Isobel Watson fortunately rejected the offers of the 'good Samaritan' and lived to tell the tale.