
If the Zodiac Killer had left the crime scene at say 5:58pm, it would have taken him about 7 minutes to walk 510 yards uphill to the 1956 White Karmann Ghia of Bryan Hartnell. Two minutes to write the message on the car door and remove/conceal his costume, has the Zodiac Killer signing 6:30 at approximately 6:07pm. The journey time walking north from the car of Bryan Hartnell to Smittle Creek Day Use Area (5600 Knoxville Road) is 0.8 miles. Police noted that this was the location of the Dr. Rayfield & Son sighting of a man walking north across the hillside. Across less than favorable terrain, this journey time would have taken the Zodiac Killer approximately 25 to 30 minutes. This means that the Zodiac Killer would be passing Smittle Creek at about 6:32 to 6:37pm.
In his submission to police "Dr Rayfield stated that about 6:30 pm the previous evening (September 27th), he and his son had parked their car north of Park Headquarters in the general area of the crime scene. They stated they went down towards the beach area when David noticed a white male adult subject walking in the area, described as about 5'10", heavy build, wearing dark trousers, a dark shirt with red in it, long sleeves". They had parked their vehicle at 6:30pm, but by the time they had got their belongings from the car, traveled down towards the beach and spotted the "subject at a distance of about 100 yards", it was likely closer to 6:32 to 6:35pm. The exact time the Zodiac Killer would have passed this area from the Volkswagen Karmann Ghia.
This could suggest that the Zodiac Killer was stalking the hillsides of Lake Berryessa for upwards of 3 hours looking for suitable victims, just like he may have done at Lake Herman Road, parking his white Chevrolet Impala in the turnout and venturing into the adjoining fields in the hours before the double shooting on December 20th 1968. A murderer prepared to diligently look for victims over a protracted period of time. At Lake Berryessa we had three incidents reported to police spanning 3:30pm to 6:30pm, within 0.8 miles of one another, of which two were at the same location of Smittle Creek. But was it the Zodiac Killer stalking the hillsides that day, with a vehicle parked slightly north of the Rayfield sighting?
Thanks again to Jibberjabber.