The discrepancies pointed out in the 2007 Zodiac documentary have been extensively covered on this site- and will be again, when we examine another section of the dialogue regarding the two main protagonists. It has been stated innumerable times, the contention that Donald Fouke and Eric Zelms not only stopped Zodiac, but were directed away from the crime scene by the killer toward Arguello Boulevard.
Donald Fouke stated in the 1989 'Crime of the Century' documentary "We proceeded on Jackson Street towards Arguello continuing our search, as we arrived at Arguello Street the description of the suspect was changed to a white male adult, believing this suspect was possibly the one involved in the shooting we entered the Presidio of San Francisco and conducted a search on West Pacific Avenue, the opposite side of the wall and the last direction we observed the suspect going, we did not find the suspect." 
We shall focus on the part of the 2007 documentary beginning at 1:18:09.
After noticing a white male adult walking along Jackson Street, Donald Fouke proceeded onward, stating "Seeing that it was a white male in an affluent neighborhood walking along the street, we didn't think it was the suspect. So we proceeded the next block at...which was Jackson and Cherry. Turned southbound on Cherry Street and saw Armond Pelissetti, one of the officers who had responded directly to the scene" Was he about to say proceeded the next block at Arguello.
Armond Pelissetti picks up the story "At that point Officer Dan Fouke, who was accompanied by what I believe was a rookie officer Eric Zelms at the time, pulled up very quickly in their police car, called out to me did I see anybody, did I know anything about where the suspect could be and I told him no." 
Donald Fouke continued "He stopped us (Pelissetti) and said he was looking for the white male that had just gone down the street. There was a little conversation about what the initial description was, and he said no, he was a white male. I then used a slang term and said 'oh that was the suspect'"  Armond Pelissetti responded "He did not mention to me that he had seen anybody at that point or stopped anybody."     

We know that Armond Pelissetti was told the suspect was white by the three teenagers at the crime scene, and in his words "couldn't get to the radio fast enough at that point to let everybody else know."
Armond Pelissetti stated "​The kids had told me whoever had done this crime had left the cab, went out the door and seemed to be wiping the cab down and reaching into the cab and ambling or walking down Cherry Street in a northerly direction, kind of towards the Presidio. I walked that way myself, I did not run because there are innumerable alcoves and parked cars, so I went down following every technique I knew so I didn't get my head blown off." 
We know that walking Cherry Street at a normal speed would take approximately one minute, but at least 90 seconds to 2 minutes if you were "following every technique" in the police manual. 
So, after updating everybody to the new white male description, Armond Pelissetti likely informed his partner Frank Peda of the amended description and asked him to secure the crime scene, before heading off up Cherry Street. Therefore, by the time he met Officer Donald Fouke at the top of Cherry Street, at least 2 minutes must have elapsed. Assuming that Donald Fouke received the amended white male description almost immediately, then he must have received it before Armond Pelissetti headed up Cherry Street (approximately 90 seconds to 2 minutes ago). That is, 90 seconds to 2 minutes prior to meeting Armond Pelissetti. The journey time from Donald Fouke spotting Zodiac to reaching this section of Cherry Street (440 feet), traveling at 30 mph, takes only 10 seconds. Even if we gave Donald Fouke 30 seconds, one can see that by the time he spotted Zodiac, he would have already received the amended white male description at least 1 to 1 1/2 minutes prior to spotting Zodiac. So why didn't he stop him? The answer being; that Donald Fouke didn't turn down Cherry Street, but continued on to Arguello Boulevard (where Zodiac directed him) and down West Pacific Avenue, before returning to Cherry Street, where he met Armond Pelissetti. This diversion by Donald Fouke took just over 2 minutes. We know this, because, in the 1989 documentary Donald Fouke stated "as we arrived at Arguello Street the description of the suspect was changed to a white male adult."  Donald Fouke, realizing this was the man he had just seen on Jackson Street turn up Maple Street moments earlier and may be the possible killer, swung into West Pacific Avenue toward Julius Khan playground. After an unsuccessful search in this area, he returned toward the crime scene and bumped into Armond Pelissetti at the top of Cherry Street. This 2 minute diversion of Donald Fouke from Arguello, would corroborate Armond Pelissetti's 2 minute journey up Cherry Street after updating Donald Fouke over the radio from the crime scene, enabling them to meet at this exact point. 

One thing has always perplexed when we consider Zodiac's movements that night. Whether you believe that Zodiac had blood on his clothing that night or not, why would a killer who must have seen and heard Donald Fouke's approaching police car 'red light and siren' from quite a distance (possibly blocks away), as shown here on Google maps, why didn't he attempt to conceal himself. Not only that, why was he walking on the north side of the street in full glare of approaching vehicles, when the obvious choice would have been to turn from Cherry Street and stay on the south side until he reached Maple Street or his required turn off.
If we take a look at the memorandum on the right, it is signed by Donald Fouke, but appears to be written on his behalf. Nevertheless, it states "a suspect fitting the description of the Zodiac Killer was observed by Officer Fouke walking in an easterly direction on Jackson Street and then turn north on Maple Street." But there is no mention of which side of the street the suspect was on-bearing in mind this was dated November 12th 1969. Only later would it be mentioned that the Zodiac was apparently on the north side. With ample time to spot the approaching police car, this seems on the face of it, a strange choice by the Zodiac Killer, particularly if you are an advocate of a killer smothered in the victim's blood.
Considering Donald Fouke was driving that night, coupled with his extensive description of the killer, wouldn't it be more likely the Zodiac Killer was walking on the south side of Jackson Street that night. 
In the Zodiac Killer's November 9th 1969 'Bus Bomb' letter, he stated "p.s. 2 cops pulled a goof abot 3 min after I left the cab. I was walking down the hill to the park when this cop car pulled up + one of them called me over + asked if I saw anyone acting suspicious or strange in the last 5 to 10 min + I said yes there was this man who was runnig by waveing a gun & the cops peeled rubber + went around the corner as I directed them + I disappeared into the park a block + a half away never to be seen again". 
When you read the last line of the memorandum it states "My partner that night was officer E. Zelms #3248 of Richmond Station. I do not know if he observed this subject or not." This appears a stretch, when you consider the detailed description of the subject given by Donald Fouke from the seat furthest away from the north sidewalk, especially when he claimed he slowed down for 5,10, 15 seconds. It is more believable if Eric Zelms is scanning the north side from the passenger seat and Donald Fouke is scanning the south side from the driver seat, and Zodiac is walking on the south side.
If we believe Eric Zelms was being shielded from the events that night, and equally believe Zodiac's claims of being "called over" to the police car- and meshing it with Donald Fouke's extensive description of the subject- then it could be argued that the Zodiac Killer was called over from the south sidewalk by Donald Fouke. 
The Zodiac Killer would then direct Donald Fouke to Arguello Boulevard, and the article can begin again.  

Kim Rossmo is a Canadian criminologist who pioneered the art of geographic profiling- a technique used to compliment conventional police work in the tracking of criminals. He has used data from the Zodiac Killer case to narrow down the likely residence and possible commuter routes of the murderer, and even a suggestion of where he may have worked. When the details from the Zodiac case were placed into the Rigel crime mapping software it created significant zones of interest in Rancho Vallejo, northern Vallejo, American Canyon and Benicia. These areas have one critical commuter route relevant to all- that of California State Route 37- which the significance of regarding Zodiac's knowledge of courting couples, his base location and possible workplace will become apparent. Some of Kim Rossmo's ideas will be presented here, but to read his excellent analysis of the Zodiac case, please visit here. 
Below is a map showing all the relevant locations concerning the killer's first two crimes- the red circle at the northern end of Tuolumne Street being of significant interest, as it also brings into focus the easy access to and from the payphone after his murder and attempted murder of Darlene Ferrin and Michael Mageau at the Blue Rock Springs parking lot on July 5th 1969. The journey time to the payphone from the crime scene of less than 10 minutes, and the phone call to police nearly 40 minutes after the attack lends good weight to the premise the killer was a native Vallejoan, and possibly returned home to ditch his weapon and/or clothes before returning to place the call to police dispatcher Nancy Slover.  

What better way to have knowledge that Lake Herman Road and Blue Rock Springs were frequented regularly by courting couples, than if you routinely traveled this route to reach your place of work, not unlike eyewitness James Owen who lived at 1735 Mini Drive and would have likely used California State Route 37 at the beginning of his journey, to arrive at Humble Oil in Benicia. The same applies to an area around Mare Island Shipyard and Rancho Vallejo, where Tuolumne Street nears State Route 37. Lake Herman Road on the eastern fringes of Vallejo and Benicia, is a dark, unlit stretch of rural road infrequently used. It is, however, a logical choice for somebody living in Ranch Vallejo (north Vallejo) or American Canyon to use, if they worked in the industrial area of Benicia.
The northern side of the green line on the map above, shows that access to State Route 37 would take somebody towards the northern side of Columbus Parkway, before heading southeast along Lake Herman Road towards Benicia, and crucially encompassing both crime scenes. If the killer lived in the northern region of Vallejo and worked in Benicia, his 'compass' knowledge of specific locations would not be surprising. This was evident in his first attack when he stated in the July 31st 1969 letters, that Betty Lou Jensen "was on her right side feet to the west." Of course, he had six and a half months to work this out, but had only 36-38 minutes after the Blue Rock Springs attack, in which he was able to direct Vallejo police to the crime scene along Springs Road and Columbus Parkway with completely accurate directions when he called Nancy Slover, stating "I wish to report a double murder. If you will go one mile east...... on Columbus Parkway to the public park, you will find the kids in a brown car. They have been shot with a 9 mm Luger. I also killed those kids last year.... Good-bye." 
Knowledge such as this, could suggest complete familiarity with the public park, golf course, Lake Herman Road and the location of the police station with respect to the Springs and Tuolumne payphone. 
The killer would have one direct route, to and from his residence to the payphone at the intersection of Springs Road and Tuolumne Street. His route to work (possibly a night-shift) also giving him first hand knowledge of courting couples and where to trawl for victims at the weekend.   

Kim Rossmo, referring to Lake Herman Road and Blue Rock Springs Park, stated "In contrast, his target selection at Lake Berryessa and San Francisco did not show any evidence of local area knowledge. Also, the time lapse between the Blue Rock Springs shooting and the Zodiac’s telephone call was approximately 40 minutes, even though the distance between these two locations is only 3.5 miles (7 minutes normal driving time). What did he do for that other half hour? One possibility is that he returned home and disposed of his weapon. If so, that means he most likely lived within a five-mile radius of the crime site. The Zodiac also knew to telephone the Vallejo Police Department, even though the Blue Rock Spring Golf Course and park area was an unusual offshoot of municipal jurisdiction, totally surrounded by Solana County. The Zodiac’s comfort zone clearly includes the Vallejo area."
However, there is one thorn in our side- the testimony of Michael Mageau. He stated in the police report "as he fell out onto the ground the vehicle the subject was in backed up in a turning movement and then took off toward Springs Road in Vallejo at a very high rate of speed." The obvious route back home for the killer, had he lived somewhere by the top of Tuolumne Street, and wanted to ditch his weapon and clothes before making the call to police, would have been to head north and west along Columbus Parkway- the opposite direction that he chose for work. There may be several explanations for this.
Michael Mageau was simply mistaken, the killer's initial intention was to make the phone call immediately but changed his mind, preferring to remove his weapon and possibly bloodied clothing from the equation, or the intended payphone at the initial time of his arrival had potential eyewitnesses, forcing a hasty change of plan. This may have been his preferred choice of payphone, as it provided easy access to and from his home residence, yet allowed a reasonable 'buffer zone' of just over two miles. It had the added benefit of a voyeur killer who wanted to remain in his vehicle and watch responding officers scurry into action from the police station, along Springs Road to the crime scene. It may actually have been the primary reason he chose this particular payphone so close to the police station, despite it seemingly being an added unnecessary risk on his part.        

There may be another reason why the Zodiac Killer chose the 'wrong way' after leaving the Blue Rock Springs parking lot. A reason that involved near eyewitnesses to the murder in the parking lot..
Three young kids, Debbie, Jerry and Roger were the first to find Michael Mageau just after he had extracted himself from the brown Corvair and was lying adjacent to it.
They must have arrived extremely close to the time of the attack- possibly as little as a minute or two after the brutal shooting. The time of the attack can be calculated with a fair degree of confidence to 12.02 am on July 5th 1969. See here. 
Police dispatcher Nancy Slover received a phone call from Jerry's house at  938 Catlewood Drive, Vallejo from Debbie at 12.10 am. The drive to 938 Castlewood Drive from Blue Rock Springs is approximately 6 minutes, indicating they would have had to leave the parking lot by about 12.04 am to make this phone call in time.
​Yet, this isn't the time they arrived at the parking lot, which must have been around a minute earlier at 12.03 am- just after the attack at 12.02 am. The Zodiac Killer may literally have been leaving the Blue Rock Springs parking lot as they were approaching it. This may have influenced the direction Zodiac exited from the crime scene.
Debbie, Jerry and Roger stated in the police report that "they had been downtown to see the festivities for the 4th of July. After this was over, at about 11 pm, they decided to look for this girl that Roger knows. They drove around town and did not see her and decided to go to Blue Rock Springs Park to look for her. They went out the freeway to Columbus Parkway and came into the park the back way. While they were driving in toward the park neither boy recalls seeing any vehicle coming out, none parked along the road, nor did they pass any vehicle."  They must have been almost on top of Zodiac as they approached from the north side of Columbus Parkway. Had Zodiac intended to travel home before making the phone call, his obvious route north and then west along Columbus Parkway, was now not so obvious if he didn't want himself or his vehicle spotted by the three kids. They obviously didn't see him, but he may have spotted their vehicle approaching in the distance. This may have forced a change of plan and coerced Zodiac south toward Springs Road.
The journey time heading in this direction to somewhere close to the green circle at the top of Tuolumne Street, would take approximately 11-12 minutes. The Zodiac Killer would arrive home at about 12.14 am- leaving him approximately 20 minutes at his residence before driving back to the Springs and Tuolumne payphone to make the call. Once doing so, his escape home is a mere 4 minutes.  
Calfornia State Route 37 and Highway 101 may have played a decisive factor when selecting a quick and easy separation from San Francisco after the murder of taxicab driver Paul Stine on October 11th 1969. Whether or not the murderer had entered the Presidio Park is a moot point today, but in 1969 the Zodiac Killer would certainly have wanted to escape from the area in as little time as possible. A vehicle parked somewhere along West Pacific Avenue or to the east of the park in Cow Hollow, would provide immediate access to Highway 101 across the Golden Gate Bridge, and in a handful of minutes out of San Francisco. The killer can then head north and eventually east just before Novato, taking California State Route 37 right onto his doorstep.  

The selection of a taxicab driver to take him to a predetermined destination so close to an exit route from San Francisco, one could argue was the perfect choice for a resident of Vallejo. The killer has a nearby park in case things don't go to plan, along with an immediate escape and separation from the crime scene via Highway 101 and the Golden Gate Bridge. Even Inspector Dave Toschi thought this a viable proposition: "The detectives heard from neighbors that a stocky figure was seen dashing across Julius Khan playground and into the dense undergrowth of the Presidio. The dog patrol units, seven of the best search dogs in the country, gathered at the front entrance of the Presidio and were deployed one at a time in various directions. Armstrong and Toschi considered the possibilities. Had the killer gone quickly through the dark woods and emerged from the Presidio at Richardson Avenue, and taken Highway 101 past Fort Point onto the Golden Gate Bridge and vanished into Marin County."
Kim Rossmo made an extremely salient point regarding the murder of Paul Stine.
He stated: ​​"The San Francisco murder differs significantly from the Zodiac's other crimes. Up to this point he was hunting in locations that had a good probability of containing his desired victims. Target selection was a function of area, not of an individual. However, it is unlikely the Zodiac was successful in all his searches; serial killers typically engage in extensive hunting activities, and for every attack there are many unsuccessful search attempts. In San Francisco, however, the Zodiac controlled the situation through his selection of victim type. The need for such control could be indicative of the distance the Zodiac had to travel to the crime site. Criminals who travel longer distances to offend are less likely to use uncertain target selection techniques."  Control your location and you control your escape route.
The Lake Berryessa attack on September 27th 1969 speaks for itself. The killer headed to downtown Napa and the payphone at 1231 Main Street. He may have been only 12 miles from California State Route 37 and home, had he continued the trajectory he had set for himself. Was the Zodiac Killer's apparent knowledge of a road on the fringes of Vallejo more indicative of his recreational habits or a route he traveled daily..... particularly when the sun went down. 

There are no images of the Paul Stine trip sheet from Presidio Heights, so we have to take on word that the destination chosen by the Zodiac Killer was the intersection of Washington and Maple. However, the taxicab was discovered one block further at the intersection of Washington and Cherry. What was the reason for this discrepancy?
#1. Paul Stine was murdered at Washington and Maple and the Zodiac Killer drove the taxicab one block further.
#2. Paul Stine was murdered before Washington and Maple and the Zodiac Killer drove the taxicab to Washington and Cherry.
#3. The Zodiac Killer intended to murder Paul Stine at Washington and Maple, but the presence of people on the sidewalk or in vehicles at this location forced him to change his plans.
#4. The Zodiac Killer intended to murder Paul Stine at Washington and Cherry, he simply stated Washington and Maple to throw investigators off the mark.
#5. The Zodiac Killer intended to murder Paul Stine at Washington and Cherry, he simply made a mistake in giving the destination as Washington and Maple, and realized this on his approach to the area or somewhere en route.
#6. The Zodiac intended to murder Paul Stine at Washington and Maple, but had second thoughts (or exhibited hesitation) before ultimately settling on murder one block later.
​#7. Another scenario.

The Zodiac Killer's first three attacks were on couples, before switching to the murder of Paul Stine in Presidio Heights, San Francisco on October 11th 1969. It was considered that he may have 'changed his way of collecting slaves' in the fourth attack, due to the newspaper coverage, insinuating or suggesting he targeted the females primarily and likely feared the males, or the crimes themselves had a sexual component. However, an attack on a lone person in San Francisco was probably cemented in his mind, at least as early as July 31st 1969. Two of the three letters postmarked July 31st were mailed to the San Francisco Chronicle and San Francisco Examiner, and both failed to mention couples: The Chronicle letter stated "I will cruse around all weekend killing lone people in the night then move on to kill again, until I end up with a dozen people over the weekend." The Examiner letter stated "I will cruse around killing people who are alone at night untill Sun Night or un till I kill a dozen people." The Vallejo Times-Herald letter was the only letter that mentioned couples: "I will cruse around and pick of all stray people or coupples that are alone then move on to kill some more untill I have killed over a dozen people." This tends to indicate the Zodiac Killer was well aware of his locations of opportunity and the 'availability' of courting couples in Vallejo as opposed to San Francisco. 
The following observation may be reading a little too much into the Zodiac's wording, but the Vallejo Times-Herald communication is the only one of the three letters he used the past tense regarding his mailing of the letters. He used the phrase "Here is a cyipher or that is part of one. the other 2 parts have been mailed to the S.F. Examiner + the S.F. Chronicle,"  whereas the San Francisco communications used the present tense: "The other 2 parts are being mailed to the Vallejo Times + S.F. Chronicle" and "Here is part of a cipher the other 2 parts of this cipher are being mailed to the editors of the Vallejo Times and SF Examiner." If he was a resident of Vallejo, and was going to post all three communications somewhere in or near the Richmond District of San Francisco, which he did, then subconsciously on his future return to his residence in Vallejo, he would have posted the other two communications (to the Examiner and Chronicle). That is because he is associating the Vallejo Times-Herald with his home location. The letter he is sending to the Vallejo Times-Herald is close to his residence, so he labels the two San Francisco communications containing the word Vallejo, as are being mailed, because he is projecting further ahead. This subconscious use of words may very early on have told us exactly where the Zodiac Killer lived- somewhere he knew that couples were readily available over the weekend, before he returned to work in San Francisco on Monday morning.    

One always has to question why the killer after the Blue Rock Springs attack on Darlene Ferrin and Michael Mageau, who apparently lived in San Francisco, wouldn't just make the phone call somewhere equidistant between Vallejo and San Francisco, rather than from a payphone relatively close to the crime scene and extremely close to the police station. Why was he apparently constrained in choosing a payphone 10 minutes from the crime scene, yet 40 minutes after the double shooting, if it wasn't for the fact he lived in the Vallejo area, or extremely close to the payphone. 
If the killer lived in Vallejo and traveled to San Francisco weekly for his occupation, where did he work?. There are plenty of reasons to believe the Zodiac Killer knew the Presidio Heights area fairly well. If you are going to murder a taxicab driver in an affluent, built-up area, in the heart of San Francisco, it would have been advisable to know everything about the area and your likely escape route in advance.
There are two ways to enter San Francisco by vehicle from Vallejo- either by the Golden Gate Bridge or Oakland Bay Bridge. Either journey from Vallejo to the Richmond District is approximately the same distance. But if you entered via the Golden Gate Bridge every day, you would certainly have every opportunity to become accustomed to the roadways in and around the Presidio Park area. This is the area the Zodiac Killer may have left his vehicle- somewhere on the fringes of the park, by West Pacific Avenue or Lyon Street- towards the east. 
A man fitting the description of Zodiac was seen running into the Julius Khan playground minutes after the murder of Paul Stine- a description that virtually matched that of the three teenagers and Officer Donald Fouke. If we contend this wasn't the killer, then we have to conveniently dismiss this independent eyewitness testimony as erroneous. Even Dave Toschi believed this was a viable sighting, as search dogs and police vehicles were stationed alongside the Julius Khan playground. 
A passage in Robert Graysmith's book Zodiac appears to corroborate the premise that eyewitnesses at, or near Spruce Street, observed a man running into Julius Khan playground, and tallies with the October 12th 1969 San Francisco Chronicle article. Here is the excerpt: "The detectives heard from neighbors that a stocky figure was seen dashing across Julius Khan playground and into the dense undergrowth of the Presidio. The dog patrol units, seven of the best search dogs in the country, gathered at the front entrance of the Presidio and were deployed one at a time in various directions. Armstrong and Toschi considered the possibilities. Had the killer gone quickly through the dark woods and emerged from the Presidio at Richardson Avenue, and taken Highway 101 past Fort Point onto the Golden Gate Bridge and vanished into Marin County." Richardson Avenue leads onto Highway 101 and the Golden Gate Bridge- a route the killer would be completely familiar with, had he traveled this way to and from work each day. Even if he didn't travel this exact route, if he worked in the Richmond District area, he would surely be familiar with the surrounding area and his best escape route from the intersection of Washington and Cherry.  

The website (now not available online) crackproof.com examined the Zodiac communications and their associated postmarks. This indicated that the July 31st 1969 '408' letters were franked in the Central Richmond District, and the Paul Stine letter, mailed two days after the murder, was franked in the Inner Richmond District. This doesn't mean they were necessarily posted here, but processed at this location (these letters were franked 1A and 1B). However, they were very likely posted by the killer somewhere in the northwest region of San Francisco, with Richmond being a strong possibility.
This area and vicinity is an extremely significant area when it comes to the exploits of the Zodiac Killer in San Francisco. This can be seen in the Google map diagram below.     

The only claimed Zodiac victim outside of the canonical five and Bay Area, known to have once lived in San Francisco was Donna Lass, who disappeared on September 6th 1970 from South Lake Tahoe. She worked at the Letterman General Hospital in the Presido and resided at 4122 Balboa Street in the Outer Richmond District. Did she ever cross paths with the Zodiac Killer while she worked here?
On April 20th 1970 the '13 Symbol' cipher arrived at the San Francisco Chronicle stating "I am mildly cerous as to how much money you have on my head now.  I hope you do not think that I was the one who wiped out that blue meannie with a bomb at the cop station.  Even though I talked about killing school children with one. It just wouldn't doo to move in on someone else's teritory.  But there is more glory in killing a cop than a cid because a cop can shoot back.  I have killed ten people to date. It would have been a lot more except that my bus bomb was a dud.  I was swamped out by the rain we had a while back." In the letter the Zodiac Killer was referring to the murder of San Francisco police officer Brian McDonnell on February 16th 1970, two months earlier, when a bomb packed with fence staples exploded on an outside ledge of the 1899 Waller Street, Park Police Station in the Upper Haight neighborhood. This location, bordering Golden Gate Park  and the Richmond District areas, is only 1.45 miles south of the Paul Stine crime scene.  

The next Zodiac communication was the 'Dragon' card mailed on April 28th 1970, depicting what appears to be characters from a novel by Miguel de Cervantes Saavedra, in which Don Quixote, on his horse Rocinante, and Sancho Panza his squire, perched on a donkey called El rucio, embark on a mission to restore chivalry. The Zodiac Killer wrote on the face of the card "I hope you enjoy yourselves when I have my Blast." Was this a case of Zodiac rubbing salt into the wounds of the San Francisco Police Department, choosing this card for a specific reason. The 1899 Waller Street Police Station is situated on the boundary of the San Francisco Golden Gate Park, in which the memorial statue of Miguel de Cervantes, featuring Don Quixote and Sancho Panza sits. So was this card really just a random choice, or was Zodiac simply 'needling the blue pigs'.
In the following correspondence, the 'Button' letter, on June 26th 1970, the Zodiac Killer suggested he may have been responsible for the murder of Sgt Richard Radetich a week earlier. Officer Radetich was gunned down by three shots from a .38 caliber revolver at point blank range through the driver side window of his vehicle, while in the process of serving a parking ticket. He was sat in his police car near 643 Waller Street, San Francisco, in the Lower Haight District, where he sustained life threatening injuries and subsequently died 15 hours later.
643 Waller Street is only just over a mile from the Golden Gate Park and the Richmond District of San Francisco. One can see the clustering of these Zodiac 'events' within the northwest corner of San Francisco, and around the Richmond District area. Even the 'Dripping Pen' card mailed on November 8th 1969 was supposedly mailed just south of this area.
Nobody can definitively pin down the likely profession of the Zodiac Killer, but did it reside somewhere in this region- somewhere he could mail his communications to and from work. The question is always asked: Why would the Zodiac Killer mail a noticeable amount of his correspondence from the vicinity of where he worked?- that would be stupid. The answer probably lies within the geographical profiling term 'the least effort principle.' That, when a human can exert the least effort in accomplishing a given task (with little risk), they probably will. Obviously, he realized that the ability to trace a letter or card back to a particular mailing point is practically impossible. Only to the area the letter was franked. 
The final observation on the map above, is the locality and proximity of the three golf courses to the Richmond District- bearing in mind the golf course adjacent to the Blue Rock Springs parking lot. Could the Zodiac Killer have worked at one of these locations, or did he play golf on a regular basis, taking his scorecard from the clubhouse into the very communications he mailed.  

Here we will take another look at the timeline of Presidio Heights from the perspective of Armond Pelissetti, to show how incredibly tight the whole affair is. We will use the police report from the following morning and the claims of Armond Pelissetti in the 2007 Zodiac documentary to create the only viable timeline based on what has been stated. These are their words, not mine.
Armond Pelissetti received the police dispatch at approximately 9.58 pm and likely exited his police car at around 9.59 pm- at which point one of the Robbins kids, who spotted Zodiac in and around the taxicab that night- pointed out to Armond Pelissetti that Zodiac was approaching the intersection of Jackson and Cherry Street. This being the case, then Zodiac is at this intersection at 9.59 pm. Armond Pelissetti then ushered the children across the street to their residence. He then proceeded back to the taxicab and checked the status of Paul Stine, stating in the documentary he was 99% sure the taxicab driver was deceased. He then retook the description from the children and was now aware it was a white male adult, so "couldn't get to the radio fast enough" to inform the other officers of the amended description. He then likely set off up Cherry.
These were his exact words in the 2007 documentary:"it was then I was told it was a white male, I couldn't get to the radio fast enough at that point to let everybody else know. The kids had told me whoever had done this crime had left the cab, went out the door and seemed to be wiping the cab down and reaching into the cab and ambling or walking down Cherry Street in a northerly direction, kind of towards the Presidio. I walked that way myself, I did not run because there are innumerable alcoves and parked cars, so I went down following every technique I knew so I didn't get my head blown off." 
Nobody knows for sure how long all these actions took, but a bare minimum of 2 minutes spent at the crime scene seems a reasonable estimate. This would have Armond Pelissetti beginning his journey north on Cherry Street at 10.01 pm.

Now we shall flip the timeline backwards using two points of reference. The first is from the police report countersigned by Armond Pelissetti on October 12th 1969. It stated "P.E.H. ambulance #82 responded, steward Dousette, victim was examined and pronounced dead at 10:10 pm. Inspector Krake responded and summoned dog units and a fire department 'spotlight' vehicle to assist in the search. R/Os called for the Crime Lab, Coroner, Yellow cab officials, and a tow." This section of the police report tallies perfectly with Armond Pelissetti's recollection in the 2007 Zodiac documentary as he approached Maple Street  "I turned to the right and saw a man walking his dog. He was somewhat older than the description I had, a whole lot thinner and he had absolutely no blood on his clothes." After a brief discussion with the man, Armond Pelissetti continued "I got back to the scene, and it was sometime shortly thereafter that the ambulance crew, the coroner, a firetruck, Inspector Walt Krake of the homicide detail, and then about three or four or five minutes thereafter Inspector Dave Toschi and Bill Armstrong, two of the best, arrived."  

It can be seen that by marrying these two statements that ​Armond Pelissetti arrived back at the crime scene "sometime shortly" before the ambulance crew arrived, who "pronounced Paul Stine dead at 10:10 pm." This would place Armond Pelissetti arriving back at the crime scene at a reasonable estimate of 10.08 pm.
Therefore, Armond Pelissetti left the crime scene at 10.01 pm and arrived back at approximately 10.08 pm. According to the widely held consensus and the storyline of the 2007 Zodiac documentary, Armond Pelissetti traveled up Cherry Street (which is a 1 minute journey at normal walking pace) extremely cautiously, checking the alcoves and parked cars "following every technique I knew so I didn't get my head blown off." He then supposedly bumped into Officer Donald Fouke (whether it was on his outbound or inbound journey is irrelevant on this occasion). He then presumably applied the same caution down Jackson Street (a 2 minute journey at normal walking pace), checking the alcoves and vehicles, before bumping into a man walking his dog on Maple Street. He had a brief conversation with the dog-walker, before heading back on the 3 minute journey to the crime scene, now presumably at normal walking speed. This whole sequence of events taking just 7 minutes.
The journey from the crime scene to the intersection of Jackson and Maple is approximately 3 minutes, a fact even confirmed by Zodiac: "2 cops pulled a goof abot 3 min after I left the cab." But if Armond Pelissetti was using every police technique he knew, checking the innumerable alcoves and parked vehicles, this journey must have taken at least 5 minutes. This would have placed Armond Pelissetti arriving to the dog-walker at about 10.06 pm. He then had just 2 minutes to talk to the dog-walker and arrive back at the crime scene at 10.08 pm, sometime before the ambulance arrived and eventually pronounced Paul Stine dead at 10.10 pm. We can throw in some leeway here and have Armond Pelissetti arriving back at 10.09 pm, giving him three minutes to converse with the man on Maple Street and return back to the intersection of Washington and Cherry. Nevertheless, it is an extremely rushed affair, considering Armond Pelissetti's outbound journey of 5 minutes or inbound journey of 3 minutes, also included talking to the dog-walker and Officer Donald Fouke.        

After some grueling and labor intensive detective work on my part, I was able to track down Fido, the dog from that night, and you can tell by his expression on the right, he wasn't impressed with the timeline I presented to him either. Or the suggestion his owner was a cold-blooded killer. I stroked his furrowed brow, made my excuses and left the kennel with my tail between my legs.
But in all seriousness, this drives to the heart of the question posed by some- was the dog-walker somehow the killer? Without debating the legitimacy of suspects- if Kjell Qvale was the owner of Fido, then he had to depart the intersection of Jackson and Cherry Street at 9.59 pm (going on the sighting of the three teenagers with Pelissetti), and travel approximately 3 minutes to be firmly ensconced in his 3636 Jackson Street residence. He then needs about 1 minute to return to the area of Maple to be spotted by Armond Pelissetti. This allocation of 4 minutes shifts the time to 10.03 pm, leaving Kjell Qvale three minutes to enter his home, change clothes, put Fido on his leash and leave the residence. He would then arrive to the meeting with Armond Pelissetti at approximately 10.06 pm.
The timelines of Armond Pelissetti and Kjell Qvale are possible, albeit extremely rushed. However, this is nothing new for the Zodiac case. 

Robert Graysmith stated "The operator jotted down the answers (of the phone call by the kids). Immediately, the card was handed to the dispatcher, who leaned forward over his lighted panel, consulted a complex map of San Francisco divided into districts and sectors, and broadcast a general call to all police units, cars, and wagons: an APB." The time was 9.58 pm. ​

"At this time, Lindsey went downstairs to get a better look at what was happening, while one of the kids upstairs called the police. Downstairs, the lights were off, so Lindsey knew he could not be seen from the outside. He got close to the window and watched his actions. He was shortly joined by Rebecca. They both watched and observed in silence as Zodiac pushed the driver to an upright position behind the steering wheel, exited the car and walked around the rear of the car and opened the driver's door. Stine had fallen over onto the seat and Zodiac pulled him back up into the seated position and had some difficulty keeping him upright. Once upright, he was seen to have a rag, or something like a handkerchief and began to wipe down the door area and leaning over the driver, part of the dashboard. When he was finished, Zodiac calmly walked to Cherry St. and walked north."

This is a brief section from the account of the three teenagers who observed the subject in the taxicab at Presidio Heights on October 11th 1969. But why was the Zodiac Killer spending valuable time attempting to hoist Paul Stine into an upright position behind the steering wheel, when he should have been making good his escape. Had the Zodiac been aware of the three teenage eyewitnesses, it seems unlikely he would have spent an unnecessary period of time tearing a piece of shirt, then compounding the situation by trying to maneuver Paul Stine into an upright position, before casually walking north on Cherry Street and taking no evasive action upon seeing the approach of Donald Fouke and Eric Zelms' patrol car. But what was the purpose of raising Paul Stine, who was covered in blood, into a more visible position to the casual passerby. It would seem the taxicab driver out of view would be the better option in delaying his discovery and any resulting search. Here is one possibility. 
After Paul Stine had been shot and either slumped or was pulled into a lying position, the Zodiac Killer had to gain access to the back of the taxicab driver's shirt. The Zodiac likely gripped the jacket of the victim and pulled him towards and to the right, with Stine face down in the passenger floorboard. This is where the largest pooling of blood was located and where responding officer Armond Pelissetti ultimately discovered the stricken taxicab driver.
It is evident the jacket of the victim has been pulled upwards- an obvious necessity to gain access to the rear of Stine's shirt and tear a portion of the fabric. But in maneuvering the body into this position the jacket had bunched up and may have become wedged between the victim and passenger seat. Once the Zodiac had acquired the shirt piece, he may have wanted to conceal this fact by pulling the jacket back down over the victim. However, there is one big problem- he cannot achieve this with the jacket trapped between seat and victim. The Zodiac Killer attempted to elevate the victim upwards to free the jacket and pull it back down over the shirt, but from the passenger side, with dead weight, achieving the leverage is extremely difficult and Stine inevitably fell back. The Zodiac Killer exited the vehicle, traveled around the taxicab and opened the driver side door, and with his right hand braced on the dividing panel (leaving the bloodied fingerprint) attempted to haul Stine back into an upright position, to where he can now release his right hand in order to pull the jacket down over Stine's exposed back. He ultimately failed. The teenagers may have mistaken the killer simply attempting to elevate the victim, as trying to prop him back behind the steering wheel.   
This cannot be proven as the objective of the killer, but it could be argued that the only function of altering the position of Paul Stine inside the taxicab after the fact, was to alter the visible scene viewed by responding investigators.​

The police report stated "R/Os immediately checked the interior of the cab and found the victim to be slumped over the front seat with his upper torso in the passenger side, head resting on the floorboard." Armond Pelissetti did not interfere with the crime scene.
​The next portion of the police report is crucial: "P.E.H. ambulance #82 responded, steward Dousette, victim was examined and pronounced dead at 10:10 pm." Later Toschi and Armstrong would arrive: "A check with the Yellow Cab Co. revealed the victim arrived at work at approximately 8:45 pm and had only one fare prior, that being from Pier 64 to the Air Terminal. Sgt. Falk responded in G-10. Homicide inspectors Armstrong and Toschi responded and took charge. G-40, Lt. Kiel also responded." But by the time Inspectors Toschi and Armstrong had arrived, the victim had been pulled from the floorboard of the passenger side into the position seen in the crime scene photographs. This was undertaken by responding medical personnel to determine the status of Paul Stine (likely to check for vital signs), before pronouncing him deceased at 10.10 pm.

With Paul Stine in this position it would have been impossible for Dave Toschi and Bill Armstrong to notice a section of the taxicab driver's shirt had been removed.
The police report continued "The coroner responded, Deputy Schultz and Kindred and took charge of the necessary photographs of the preserved scene." The crime scene had not strictly been preserved, because the body had been moved prior to Toschi and Armstrong arriving. Furthermore, the "crime lab's initial investigation showed that the victim was devoid of any U.S. Currency, nor did he have the possession of a wallet; the ignition keys for the cab were also missing." But no mention of any missing shirt.
Once the police had finished their assessment, the victim was taken away from the crime scene. At what point in the investigation did they become aware of the missing shirt piece? Was it the Zodiac Killer's intention to somehow delay its discovery, so his declaration in the October 13th 1969 letter had the maximum impact and shock value, upstaging the police, who believed this crime was nothing more than a routine robbery and taxicab murder at this point. The whole reasoning  behind his attempted crime scene manipulation.
According to Robert Graysmith "Stine's body was the first to be autopsied that morning, a little after 9.30 am. Before the blood and grime are removed, close-up photos are made of the body fully clothed, under the guidance of the pathologist. Stine's blood-stained clothing had been removed, an identification tag wire put on each article, and placed under a drying lamp. When his clothes had dried completely, they were laid flat, with butcher paper between each article to avoid the possibility of any sort of transfer. The clothing was listed on a clothing slip and turned into the property clerk's office to be safeguarded for future lab tests." So, at what point did investigators learn of the missing shirt piece- before Zodiac mailed the October 13th 1969 letter, or afterwards.     

On October 14th 1969 Zodiac's letter arrived at the San Francisco Chronicle.
Robert Graysmith outlined the reaction of investigators: "Toschi saw the fabric and remembered it from Saturday night. "Jesus Christ" he said. "This looks like Stine's shirt Bill, I think this is Stine's shirt." Armstrong stated "We're going to bring this shirt down to the coroner's office. Stine's clothing is being held there."
​On the main floor annex, Toschi and Armstrong saw the coroner, Dr Henry Turkel, who got all of Stine's clothing out of the property clerk's office. They went back upstairs and told Lee that the cloth enclosed with the letter had come from the left lower portion of Stine's shirt."   
Were investigators unaware of the torn shirt piece of Paul Stine at the point it was received by the Chronicle. Was this the intention of Zodiac when attempting to maneuver Paul Stine in the taxicab?
On October 12th 1969, the San Francisco Chronicle ran an article on the murder, headed by 'Robbery Victim'- A Yellow Cab driver was found shot to death in his cab last night, the victim of an apparent robbery attempt in Presidio Heights."  
On October 13th 1969 the police issued a wanted poster, lumping this crime in with other taxicab robberies: "Wanted for murder and robberies of cab drivers. Suspect takes cab in downtown area at 9.30 pm and sits in front seat with driver. Tells driver destination is Washington and Laurel area or area near park or Presidio. Upon reaching destination, suspect orders driver to continue on at gunpoint into or near park where he perpetrates robbery."  
The police still appeared to consider this a simple matter of robbery, with the suspect possibly having taken a small amount of cash, the driver's wallet and the keys to the taxicab. But what thief would take the time to carefully tear a rectangular portion of the victim's shirt and remove it from the crime scene. This fact alone, should have told investigators they were not dealing with the routine robbery of a taxicab driver and thereby associating it with other robberies committed in recent weeks. The removal of the shirt piece should have set this crime apart, had they been aware that a piece was missing. Is this what the Zodiac Killer had envisioned when he mailed the October 13th 1969 letter- the element of surprise and getting one over on the police. Or did the police know all along that a section of shirt was missing- the removal of the shirt piece being withheld from publication, to verify any future contact by the killer. But why label it as a routine robbery to both the press and public alike, when it was anything but. 

The three teenagers at Presidio Heights described the suspect in the Paul Stine taxicab on October 11th 1969 as "a white male, 25-30 years old, 5'8" to 5'9", stocky build, reddish-brown hair worn in a crew cut, heavy rimmed glasses and dark clothing." A sketch was drawn up and released to the public on October 13th 1969 describing the suspect as "WMA, 25-30 years, 5'8" to 5'9", reddish brown hair, crew cut, heavy rimmed glasses, navy blue or black jacket." It is clear that this was a poster garnered from the three teenagers. 

A new and updated sketch was distributed on October 18th 1969 upon further consultation with the three teenagers. The new description was "WMA, 35-45 years, approximately 5'8", heavy build, short brown hair, possibly with red tint, wears glasses."   
On October 21st 1969 the San Francisco Chronicle ran an article entitled 'Lawmen Pool Their Zodiac Clues' stating "Meanwhile, police circulated a new composite drawing of the 'Zodiac' suspect based on further questioning of the three witnesses to Stine's killing."  
It appears on the face of it, that the sighting of a trained police officer, Donald Fouke, who apparently told Armond Pelissetti mere minutes after the murder of Paul Stine his passing of a man on Jackson Street, played absolutely no part in either composite. To disregard the input of a highly trained professional police officer seems rather curious, if not disrespectful. 
Armond Pelissetti stated in the 2007 Zodiac documentary "It seemed that Officer Fouke in that amount of time felt that he had stopped the Zodiac. Well, it's very hard to say whether he did or not, it would be a point of conjecture at this point, and he seemed quite upset. Fouke was also very clear about what the person was wearing- it just so happens the area is extremely well lit, and I cannot imagine him not seeing the shine of blood on the clothing if it had been Zodiac. I feel bad for him if he believes that was Zodiac. I don't think it was."   
Despite the fact Donald Fouke gave an extensive description of the man, in an "extremely well lit" area of Jackson Street, not dissimilar to the description given by the three teenagers- that he witnessed only minutes after the murder, traveling in the same direction as proffered by the three eyewitnesses, his recollection was roundly dismissed as Zodiac, by not only Armond Pelissetti, but the hierarchy involved in submitting both police sketches, who seemingly never consulted him.
Only eight and a half hours later, dated October 12th 1969, Armond Pelissetti countersigned a police report with Frank Peda stating that the suspect was "last seen walking north on Cherry Street, from Washington Street."  Officer Donald Fouke's sighting near Jackson and Maple was therefore clearly not recognized in this police report at all. Evidently, not a ringing endorsement to the observations of a trained member of law enforcement. The three teenagers apparently were the only eyewitnesses considered.    

That makes it all the more surprising, when we read page two of the police report: "​'#2 SUSPECT: WMA, in his early forties, 5'8", heavy build, reddish-blond, crew cut hair. wearing eyeglasses, dark brown trousers, dark (navy blue or black) "Parka" jacket, dark shoes. Suspect should have many blood stains on his person and clothing, suspect may also be in possession of the keys to the Yellow Cab, possibly has wallet belonging to the victim. Last seen walking north on Cherry Street, from Washington Street'.
This description tallied with the teenagers, but is described as #2 SUSPECT in his early 40's. By October 13th 1969,  and up to October 18th 1969, the suspect in the sketch submitted to the public was described as 25-30 years. But in the October 12th 1969 police report it details a man in his early 40's. If this wasn't Donald Fouke or the three teenagers description- then who was it?
There was a report in the San Francisco Chronicle on October 12th 1969, describing a man seen running into Julius Khan playground, but this couldn't have been #2 SUSPECT in the police report, because the police report stated the suspect was "last seen walking north on Cherry Street, from Washington Street.'
The only other eyewitness was an 8-year old child in the FBI files, secured by Alex Lewis and later redacted to read 'Xenophon Lusby Anthony, WMA, DOB 28th February 1931, resides at 3218 Jackson Street, San Francisco. For Info Ident Division, San Francisco Police Department advised; 8 year old witness in murder of cab driver identified Anthony as possible subject in this matter.'  The individual in this document would have been 37 years of age on October 11th 1969- between the 35-45 age range offered in the revised sketch on October 18th 1969. This is not inferring that  Xenophon Lusby Anthony was the Zodiac Killer, only that the description of the 8-year old could very well have been the #2 SUSPECT description given in the police report, and the sighting must have occurred somewhere between the crime scene and the top of Cherry Street. After all, the man was "last seen walking north on Cherry Street, from Washington Street.'​ 

3898 Washington Street overlooks the crime scene, on the opposite side of the street to the three teenagers.  
Using ancestry records it was possible to identify the owner of 3898 Washington Street on October 11th 1969 as Alexander Henry von Hafften. He had an 8 year 2 month old son, Robert, who lived at this residence. It is likely that this is the child mentioned in the FBI document, who recognized Xenophon Anthony from his bedroom window that night, directly overlooking the crime scene. 
However, Sick E. Von Brutal, a member on Ophion1031's 'This is the Zodiac Speaking' forum stated that he "got a Facebook reply back from Robert von Hafften today and he told me that he was not the 8 year old witness from the FBI report."
Whether he didn't want to get involved in the Zodiac case, or actually wasn't the 8-year old child described in the FBI report- one may never know. But if this definitely wasn't the child who observed somebody he thought was Xenophon Lusby Anthony, subject in the murder of Paul Stine, then this unidentified 8-year old child must still have resided somewhere between the crime scene and the top of Cherry Street. 
Was Xenophon Anthony a case of mistaken identity by the 8-year old? If so, then we could still be looking for a killer who resembled Xenophon Anthony on October 11th 1969. Somebody described as "35-45 years, approximately 5'8", heavy build, short brown hair, possibly with red tint, wears glasses" and "in his early forties, 5'8", heavy build, reddish-blond, crew cut hair and wearing eyeglasses," by four eyewitnesses, before the killer even reached Jackson Street that night. It may be the case, that the Zodiac Killer's features lie somewhere between Xenophon Anthony and the widely distributed police sketch. 
Xenophon Anthony was cross checked for fingerprints in the FBI report and ruled out as the contributor to any retrieved from the taxicab of Paul Stine, but his identification by the 8-year old, assuming the child previously knew Xenophon Anthony, could still be be very useful in validating the accuracy of the sketch supplied from the memories of the three teenagers that night. 

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The Zodiac Killer appeared to have targeted specific areas in his search for victims, such as the secluded areas of Lake Herman Road, the Blue Rock Springs parking lot and Lake Berryessa, as well as his venture into the theater district of Union Square to deliberately target a San Francisco taxicab driver. But if the Modesto abduction of Kathleen Johns was a Zodiac crime, and he lived in the Bay Area, or more specifically Vallejo, then he went to extraordinary lengths to perpetrate his fifth recorded attack. Modesto is 86 miles from the site of his first attack at Lake Herman Road. That is a 172 mile round trip from Benicia.
If the abduction was the only purpose of his visit, we would have to believe he left his residence at sometime around 9.30 pm on Sunday night at the latest, to travel for 1.5 to 2 hours to a random stretch of highway in Modesto, for the sole purpose of flagging down a passing motorist, when this same technique could have been applied anywhere from Martinez, Concord or Walnut Creek- or an area he was possibly more familiar with. Three to four hours of driving to and from the destination, plus a 2 hour abduction, would mean anywhere up to 6 hours driving, for what turned out to be nothing more than a 'joyride'. Unless of course, there was a purpose behind his visit to Modesto, and the Kathleen Johns abduction was a mere afterthought and spur of the moment decision on his way home.       

On October 11th 1969, taxicab driver Paul Stine was murdered in Presidio Heights. On October 22nd 1969, the same day as the supposed Oakland PD phone call by Zodiac, requesting that either Melvin Belli or Francis Lee Bailey, high profile lawyers at the time, appear on a chat show hosted by Jim Dunbar, Joe Stine, brother of the victim, issued a challenge to Zodiac on a KPIX news report. It was reported in the San Francisco Chronicle the following day.
Joe Stine stated "Zodiac has to be sick, a maniac. I hope that by offering myself as a target I can flush him out. I work at the Richfield Service Station at 706 Sutter Street in Modesto, near Rouse Street. I start at 7 am. I go to lunch at the Walk-In Chicken in a shopping center two blocks away, riding a bicycle along Sutter Street and leaving the station at noon each day. I go back to the service station and work until 5." 
Joe Stine lived with his mother in Modesto. 
During the interview on the KPIX news report, Joe Stine was asked: "What is your feeling among them or people in the city that you may be drawing the Zodiac here unnecessarily." 
Joe Stine stated that it was 99% likely the Zodiac wouldn't take up his challenge. It seemed unlikely, but exactly 5 months later the Zodiac appeared on Highway 132, west of Modesto. If this was Zodiac- was it a coincidence? 
Did the Zodiac make the journey to Modesto over the weekend of March 20th to the early hours of March 23rd (possibly even stopping over) with the express intention of taking up Joe Stine on his challenge and proving this 99% assertion incorrect?
Joe Stine rode a bicycle to work, that may have indicated his mother's residence was relatively close to the Richfield Service Station at Sutter Street. Had the Zodiac Killer traveled to Modesto and followed Joe Stine at any point over the weekend, thereby locating the residence of his mother- presumably, Joe Stine would not have been working on a Sunday. Whatever the case, the attack never materialized. Then Kathleen Johns was abducted just shy of Bird Road on Highway 132, en route to Petaluma, and ironically, according to the police report, the suspect drove "west on Highway 132 and pulled into a Richfield service station that was closed." He surely must have been aware it was closed?        

Kathleen Johns traveled from San Bernardino, California to Highway 132, via Highway 99, turning west just by downtown Modesto.
She would have traveled on Highway 99, just 4,840 feet, or 1.48 km east of the Richfield Service Station where Joe Stine worked- and likely close to where he resided with his mother.
​Is this where Zodiac picked up her trail, somewhere along Highway 132, en route to his weekend residence, or on his way home to the Bay Area? This may be an unlikely scenario of events, but if the Modesto abduction of Kathleen Johns was unrelated to Joe Stine, why did the Zodiac Killer make a daunting 6 hour trek all over California just to flag down and give a ride to a random motorist, that he could have done anywhere. Additionally, do we put the abduction in Modesto as a coincidence, bearing in mind Joe Stine's connection to Modesto, and the previous attack was on his brother in San Francisco. Was it just a case of happenstance?
On Zodiac Killer Site forum there is an interesting letter highlighted- sent to the editor of the Modesto Bee newspaper. AK Wilks stated "Someone reacted to Joe Stine very strongly. Doug Oswell and I, and some others, wonder if this letter from AROUSED is actually the Zodiac." Joe Stine worked near ROUSE Street.
Bearing in mind how Zodiac signed off some of his letters, it's worthy of consideration.​
The Modesto Bee communication can be viewed on the forum, or directly here.

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Here is a portion of the charter for taxicabs and sedans 'Drivers of taxicabs and sedans shall keep an accurate waybill specifically setting forth the time of hire and discharge, the number of passengers, the origin and destination and the charges authorized and made for each trip.' It is believed Paul Stine was returning back to the theater district after dropping off a passenger at the San Francisco International Airport, when he received his final dispatch from the assistant traffic manager of the Yellow Cab Company, Leroy Sweet. The police report stated "the last dispatch given the victim was at 9:45 pm to 500 9th Ave. apt. #1. Victim allegedly never arrived at the above location as the dispatch was reassigned to another cab at 9:58 pm. R/Os noted that the meter of the cab was running, indicating that the victim possibly picked up another fare (suspect) en route to his original assignment."
The language used, that 'the victim possibly picked up another fare (suspect) en route to his original assignment' seems to suggest that the exact location of Zodiac entering the taxicab has not been pinned down, despite the charter indicating the origin of the fare be noted. Investigators took a reading of the taxicab meter at 10.46 pm and calculated the Zodiac likely entered the taxicab somewhere in or close to Union Square.     

The attack on Paul Stine was specified as 9.55 pm in the police report- this being the time the three teenagers first spotted the taxicab outside their window. We actually don't know how long it was sitting there prior to the eyewitness testimony, but we will estimate 9.54-9.55 pm. 
The journey time from Union Square, traveling through in excess of thirty intersections to Washington and Cherry Street, is approximated on Google maps as 12 minutes. However, the taxicab, on a busy Saturday night, would have arrived in 9-10 minutes had Leroy Sweet's 9.45 pm statement been accurate. Leroy Sweet directed Paul Stine to a fare on 500 9th Avenue, and the assumption was, that somewhere en route the Zodiac Killer flagged down the taxicab.
​It seems unlikely that Paul Stine would stop for a random customer on the off chance he was going in roughly the same direction. If you pulled up and the person stated he was going in the opposite direction, do you just simply say sorry, and drive off. It is more likely that your taxicab is stationary when your potential fare approaches, just as your receiving the dispatch from Leroy Sweet to proceed to 500 9th Avenue. Then, upon hearing a destination of Washington and Cherry, it makes perfect sense to accommodate the pedestrian, as you are traveling in that direction anyway. A 9-10 minute journey is possible, but it's a tight timeline.
Then we factor in another statement in the police report: "Victim allegedly never arrived at the above location as the dispatch was reassigned to another cab at 9:58 pm."  Even if we take this journey at 10 minutes, Paul Stine has to drop this passenger off, and then proceed to 500 9th Avenue, which is a further journey time of 5 minutes from the Washington and Cherry intersection. Trimming this down to 4 minutes, and allowing for the previous passenger to pay and vacate the vehicle, we have a minimum journey time to 500 9th Avenue from Union Square of 14 minutes, and that is a stretch. From a starting point of 9.45 pm, this should have Paul Stine reaching 500 9th Avenue at 9.59 pm. Yet, reading between the lines, Leroy Sweet is already reassigning this fare to another taxicab at 9.58 pm. How did Leroy Sweet conclude that Paul Stine was somehow late?          

Unless, Paul Stine wasn't approaching the theater district when he got the radio message to proceed to 500 9th Avenue- but was well into his journey to Washington and Cherry, and Zodiac was already seated in the rear of the taxicab, having entered the vehicle several minutes before.
If this were the case, and Leroy Sweet knew that Paul Stine was much closer to 500 9th Avenue than Union Square or thereabouts, then it could be argued that he would reallocate the fare to another taxicab, that wouldn't be justified after just 13 minutes (9.58 pm minus 9.45 pm). Even if Leroy Sweet thought that Paul Stine was 5 minutes overdue, then he would have been expecting Paul Stine to reach 500 9th Avenue by 9.53 pm, which is an impossible journey time on Saturday night of 8 minutes from Union Square.  
This could indicate that Leroy Sweet knew that Paul Stine was proceeding west, towards Washington and Cherry, when he gave Paul Stine the 9.45 pm dispatch. But even this, hardly  explains the impatience of reallocating another taxicab to the aforementioned destination. 
The simplest answer could be, that Leroy Sweet dispatched Paul Stine at 9.35 pm, not 9.45 pm. thereby justifying any perceived impatience on his part, however, this turns the journey time of Paul Stine from Union Square to the Washington and Cherry Street intersection, into a 20 minute journey, which is now too long. Unless something happened along the way? Something that takes the focus away from the crime scene.   
These are the details regarding the taxicab meter reading taken from a previous post.
The rates of fare for taxicabs and sedans shall be as follows: Fifty-five Cents (55c) for the first one-fifth mile or "flag": Ten Cents (10c) for each additional one-fifth mile or fraction thereof: Ten Cents (10c) for each one and one fourth minutes of waiting or traffic delay time.
'The police report stated that Paul Stine's taxicab meter read $6.25 at exactly 10.46 pm. So using the taxicab meter charges here, we can backtrack and calculate the approximate pick-up point from the last known movements of Paul Stine heading back from San Francisco International Airport.
The time of the murder was specified as 9.55 pm, so by the time the meter was read at 10.46 pm, the meter had been running idle for 51 minutes. We know that it's 10c for each one and one fourth minutes (1.25) of waiting or traffic delay time. So we can discover the charge the idle taxicab ran up for these 51 minutes. (51 divided by 1.25) = 40.8. Multiplied by 10c = 4 dollars and 8 cents. The investigators deducted this from the $6.25 to give us $2.17. This calculation however, did not include any idle time en route from the proposed theater district to the intersection of Washington and Cherry. But we shall assume it negligible, as they have done. 
We know it is 55c for the first one-fifth mile. So the taxicab meter would be operating effectively from $2.17 minus 55c thereafter ($2.17 minus 55c) = $1.62. So to calculate the distance traveled we have to use the taxicab meter charges of 10c for each additional one-fifth mile or fraction thereof.  
$1.62 divided by 10c = 16.2 miles. But it is for one-fifth of a mile, so 16.2 divided by 5 = 3.24 miles traveling distance. But again, this is not factoring in any delays en route, in accordance with the History Channel calculations.
The crucial part is the 55c for the first one-fifth mile or "flag." The taxicab should be reading 55c after one-fifth of mile (0.2 miles) is achieved. Therefore, this should be added on to the 3.24 miles, to give us 3.44 miles traveling distance. This would, without any delays en route (not factored in by the History Channel), take us a little further away from Washington and Cherry.'
But these calculations are a fragile balance. What if the idle time above was 61 minutes in total, instead of 51 minutes, and Leroy Sweet's 9.45 pm, was in fact 9.35 pm. This makes the journey time from Union Square to Washington and Cherry, 20 minutes. This could be 10 minutes with the taxicab in motion, and 10 minutes parked up anywhere en route.
Below are two parks, the accessibility at night in 1969 I have no idea. These two parks, Lafayette and Alta Plaza, would not take the taxicab off route, and could have been used (holding the taxicab driver under gunpoint) by either entering or parking alongside, to execute Paul Stine. The murderer could take 10 minutes, or anytime up to 10 minutes to shoot the taxicab driver and remove a piece of shirt, before taking control of the vehicle and driving it to Washington and Cherry, accidentally or mistakenly parking the taxicab one block further west to the destination he gave as Washington and Maple- the one recorded on the trip sheet. This could explain the lack of gunshot and the assumed confidence displayed by the killer in removing the shirt piece at the crime scene- because he had already acquired it. He may have began to leave the crime scene, but returned via the front passenger door to recover the keys he had touched, wiped the steering wheel, driver side compartment, before leaving and wiping down both exterior doors. The three teenagers pick up the story once he has entered the front passenger door. This may seem unlikely, but a simpler variation of this is certainly possible. 
One has to remember though, that any extra idle time can dramatically affect the potential origin or pick up point of the Zodiac Killer. The taxicab sitting idle for an extra, let's say, 3 minutes somewhere along the route, will have a marked effect.   

If we add the 3 minutes extra idle time to 51 minutes, to give us 54 minutes, the traveling distance backwards from Washington and Cherry would drop from the 3.44 miles calculated above, to 2.96 miles. That is approximately half a mile. Then, if we throw any more waiting time, explained in the charges above, the distance traveled by the taxicab diminishes even further, making the calculations used to determine where the taxicab picked up Zodiac, an extremely inaccurate affair.
However, this 2.96 miles, is closer to the 3.00 miles from Mason and Geary to the crime scene, as calculated by Google maps, than the 3.44 miles calculated above. Without knowing the exact 'traffic delay time' experienced during Paul Stine's final journey, we cannot say with any confidence that the taxicab parked up along the route to Washington and Cherry. However, we can say that, if this was the method employed to discover the location of where Zodiac entered the taxicab, it could be massively off. If we assume that Paul Stine was heading back to the theater district after leaving San Francisco International Airport, and Leroy Sweet gave the heading of 500 9th Avenue at 9.45 pm, then we are back to where we started.