Judith Hakari was a nurse at Sutter Hospital, who disappeared heading back to the Markston Apartments on March 7th 1970. Her body was later discovered by Ponderosa Way in Weimar, forty two miles along Interstate 80.
Nancy Bennallack was murdered on October 25th 1970 in her apartment, just a stone's throw from where Judith Hakari lived, near Glendale Lane.
Carol Beth Hilburn was murdered on November 14th 1970, last seen on Del Paso Boulevard and found on Ascot and 4th Street. These two areas are bisected by Interstate 80.
Sandwiched in between these murders were the two abductions of Donna Lass and Kathleen Johns.
If we look at the relevant areas off Interstate 5 and Interstate 80, then we notice certain key features.
The site of Kathleen Johns abduction and where her vehicle was discovered burnt out is only 1 mile or 2 minutes traveling time from Interstate 5. The residence of Judith Hakari and the area her body was discovered, not only were situated alongside Interstate 80, but Ponderosa Way is only 2 miles or 5 minutes from Interstate 80, and the Markston Apartments only 4 miles or 8 minutes from Interstate 80. Regarding Carol Beth Hilburn, Del Paso Boulevard is only 2.2 miles or 5 minutes traveling time to Interstate 80, and Ascot and 4th Street only 3 miles or 7 minutes from Interstate 80.
Interstate 80 continues on to Lake Tahoe, near the area where Donna Lass went missing on September 6th 1970.
Six and a half months after her disappearance, the Pines card was mailed to the San Francisco Chronicle, purportedly from the Zodiac Killer. The search for Donna Lass was badly affected by the inclement weather in the months after her disappearance, highlighted by Police Chief Ray Lauritzen from the outset "We don't know where we're going to begin. There's a four or five foot pack of snow out there and it's still snowing heavily."
The Pines Card made reference to the snow, but in a sinister way inferred Donna Lass may be buried under it, hence the phrase 'around in the snow' being placed at ground level and pasted upside down. In a newspaper article it stated the site depicted on the Pines Card was from an advertisement published the previous Sunday by several newspapers. It was an artist's rendition of houses among the trees at a project at Incline Village, near Clair Tappaan Lodge, Norden, California, the address of which happens to be 19940 Donner Pass Road. Whether this name and that of the missing woman is a coincidence is unknown. But again, Clair Tappaan Lodge is situated right alongside Interstate 80, only 2.3 miles or 4 minutes by car, suggesting somebody traveling this route would likely have been familiar with this area and may well, as the 'Pines Card' suggested, held clues to a burial site.
On December 27th 1974, a Christmas card was mailed to Mary Pilker, Donna Lass' sister, portraying trees covered in snow. Once opened it revealed a message that was part of the card itself - 'Holiday Greetings and Best Wishes for a Happy New Year', followed by the handwriting "Best Wishes, St Donna & Guardian of the Pines."
On the 'Pines Card' mailed on March 22nd 1971, text on the card read;  'Sierra Club'  'Sought Victim 12'  'Peek through the pines'  'pass Lake Tahoe areas'  'around in the snow' (pasted upside down).
If we were reading hidden clues from this correspondence and searching for a possible burial site, then we have to follow it's directions from the last sighting of Donna Lass, at the Sahara Tahoe Hotel and Casino, and head towards the Clair Tappaan Lodge and the Sierra Club.
California State Route 89 skirts the western shores of Lake Tahoe towards Truckee, California and passes many 'Lake Tahoe Areas' en route. It finally joins Interstate 80 only 1.5 miles or 3 minutes from Donner Memorial State Park, in memory of the ill fated Donner Party.
Again, whether this was Zodiac's intention to direct us to a 'Donner Memorial', using a play on words, is sheer speculation.
But this area and the site of Clair Tappaan Lodge would certainly lend weight to the phrase 'Peek through the pines', as the lodge is literally yards from Donner Pass Road.
This brings us to the disappearance and ultimate murder of Phyllis O'Brien Carson on October 27th 1970, a significant Zodiac date, that of the Halloween Card.
Phyllis O'Brien Carson (32). was a young mother of four children, last seen after a night out at the Francis Truck Stop, French Camp, San Joaquin County, California. French Camp is a small community situated approximately a ten minute drive south of the town of Stockton CA and 15 minutes north of Manteca CA. Since the construction of California State Route 120, Manteca had become a popular choice for workers from the main towns and cities, along with the Bay Area, as rising house prices forced people to search for cheaper alternatives. Interstate 5 and State Route 99 are integral commuter routes through California and the I-5 is the main highway on the west coast of America, with links to San Diego, Los Angeles and Sacramento. San Francisco lies 80 miles and a one hour twenty minutes drive due west from French Camp.
Phyllis had visited the popular bar, along with her brother and sister on October 27th 1970 and later on during the evening placed a phone call to her home residence to check on her children, stating she was to receive a lift home from a friend. Sadly for Phyllis O'Brien Carson and her family, her journey home was never realized. She had vanished without a trace, that is until family members received the heartbreaking news, just over three weeks later, on November 21st 1970, that her body had been discovered laying down an embankment, near to Yettner Road, only five miles from the family residence.
The cause of death and perpetrator remains unknown, but foul play was certain, as her body was partially clothed, apparently thrown from a vehicle, however robbery was likely ruled out, as her belongings were untouched. Nobody from the bar has ever come forward to this day with a name of the mystery friend that Phyllis was supposed to have left with that night.
The Modesto abduction of Kathleen Johns, whether or not this has a Zodiac connection, provides the closest link, in that the perpetrator of this crime chose
to subject his victim to what appeared to be an aimless drive around the countryside of Tracy, CA, after which she escaped to a nearby field. Where the abductor was ultimately heading may never be known, but Tracy CA, San Joaquin County is a mere 15 to 20 minute drive from Yettner Road and only 15 miles due west from Manteca CA, so a familiarity with the area remains plausible. This now takes us back to the military connection.
Running right by NASA Crows Landing is Interstate 5, which then intersects with Highway 132 only 24 miles north. A journey of 22 minutes by car. In fact, Interstate 5 joins Highway 132, the route Kathleen Johns fatefully took that night, only 1.3 miles shy of where she was abducted and ultimately where her car was found burnt out, near Bird Road.
'McClellan Air Force Base (1935–2001) is a former United States Air Force base located in the North Highlands area of Sacramento County, 7 miles (11 km) northeast of Sacramento, California.
NAS Fallon in Nevada was originally built in 1942 as part of a defensive network to repel a feared Japanese invasion of the west coast. It was soon taken over by the Navy for training use and has been used as such ever since with the exception of the period of 1946 to 1951, during which it was used by the Bureau of Indian Affairs. During the years prior to 1972, the base was known as Naval Auxiliary Air Station and was heavily used during the Vietnam War by various squadrons that rotated through the base before deploying to carriers headed for Vietnam.' Taken from Wikipedia.
These military connections run from Patterson in Stanislaus County to the east of Lake Tahoe.
NAS Fallon is located just south of Interstate 80.
If the Zodiac was responsible for the Modesto abduction of Kathleen Johns and the disappearance of Donna Lass, are these subtle hints enough to convince us, to him as the responsible. These two areas span 160 miles. The question being, did the Zodiac Killer travel from the Bay Area (if he lived there), to simply commit his crimes and return, or was he likely stationed at any one of these military bases that punctuated Interstate 5 and Interstate 80. His profession may have involved him traveling between these bases, either as a member of the military, a supplier to the military or an independent contractor, nevertheless a profession that created perpetual mobility throughout areas of California.
Interstate 80 and Interstate 5 may have played a role to certain serial killers, but was the Zodiac Killer one of them.