There appears to have been little progress in the case in the intervening years, so is there anything in witness statements and analysis of Zodiac correspondence that can move the tragic events forward or shed a little more light on the subject, however incrementally small it may seem.
We shall start with eyewitness recollections taken shortly after the brutal attack and the description of a lone male spotted close to the vicinity of the crime, having caught the attention of several key parties.
Earlier on that day, three young women, students of Pacific Union College parked their vehicle at the A & W Root Beer stand in St Helena, and within seconds of leaving their vehicle, a white male, driving a silver or light blue Chevrolet 2-door sedan with California license plates pulled up to the rear of their car, bumper to bumper, yet remained inside his vehicle. This man would come into play later once the girls had headed off to Lake Berryessa, where it is believed they noticed the same man approximately 50 feet away observing them sunbathing. Each time they looked at him he evaded eye contact, thus drawing suspicion. He was described as being between 28 and 40 years, 200 - 210 pounds, 6 feet tall, styled black hair, with rounded eyes and thin lips, he was good looking, with a muscular or stocky build, wearing dark pants and a dark pullover shirt. He remained observing them, by their accounts, for between 30 - 45 minutes. But in a curious observation, the girls described a white belt around his back, or possibly a T-shirt hanging out. Another girl stated he was wearing a black short sleeved sweater shirt bunched up at the front, again describing a white T-shirt hanging out the back.
Could the descriptions given by two of the girls, describing a white belt around his back or white T-shirt 'hanging out', actually have been the cut lengths of plastic clothesline trailing from his rear pocket in anticipation of a prepared attack on the girls, but for whatever reason got cold feet, changed his mind and turned to Bryan Hartnell and Cecelia Shepard approximately two hours later. This is not a new concept but deserves more consideration.
In both instances, if indeed this was the Zodiac Killer, he appeared to be observing the potential victims for some time at a distance, possibly waiting for the right moment to don his disguise and ready his attack.
During a later interview with Bryan Hartnell a transcript revealed that the assailant had apparently stated: "I'm on my way to Mexico, I escaped from Deer Lodge Prison in Montana, Deer Lodge. I need some money to get there", later in the transcript he added "I killed a couple of guards getting out of prison. And I'm not afraid to kill again".
After the senseless attack on the couple he details his murders on the car door of Bryan Hartnell's Karmann Ghia, but despite dating the attacks of Lake Herman Road, Blue Rock Springs and the current attack, he fails to attribute the apparent murder of these two guards. That is because it is likely fiction, brought up to indicate to Bryan Hartnell that he was not to be messed with.
It has been questioned whether this attack was related to the attacks at Lake Herman Road and Blue Rock Springs, as the modus operandi varies dramatically in time, choice of weapon, theatrics and the very personal nature of the crime. The answer however, may lie 30 miles away with the hanging receiver at the 1231 Main Street, Napa payphone.
In the aftermath of the Blue Rock Springs Park double shooting, the killer placed a call from a payphone at the corner of Springs Road and Tuolumne Street. He later stated in his Debut of Zodiac Letter on August 4th 1969, "The man who told police that my car was brown was a negro about 40-45 rather shabbly dressed. I was in this phone booth having some fun with the Vallejo cop when he was walking by. When I hung the phone up the damn thing began to ring & that drew his attention to me + my car" And here lies the answer, he was unwilling to make the same mistake twice.
Was the man the three girls observed on this fateful day the Zodiac Killer, where the unusual observation and innocence of a hanging T-shirt may actually unearth the killer's true intentions during the afternoon of September 27th 1969, a day the world sadly cannot forget, yet at the same time should always be remembered.
Descriptions of the eyewitnesses:
#1. "A subject driving a late model silver-blue Chevrolet, 2-door sedan. This subject was described as 6' tall, weighing 200/210 pounds, muscular build, rather nice looking."
#2. "Vehicle described as a 1966 or 1967 light blue Chevrolet with California plates. Witness believes the vehicle was a 2-door sedan and described the headlights as long rather than round."
#3. "Subject was described as approximately 28 years of age, 6'1" to 6'2" tall, 200/225 lbs, black hair possibly styled, with a part on the left, rounded eyes, thin lips, medium nose, straight eyebrows, small ears, well built, rather nice looking."
#4. "Vehicle was described as a late model Chevrolet, sky blue in color. The rear taillights appeared to be long rather than round. She described the subject as 6' tall, stocky build, about 200 lbs, black short-sleeved sweater shirt, dark blue slacks, and straight dark hair neatly combed. She guessed his age at approximately 30 years."