Here is an extract from page 7 of the police report:
'On initial arrival, RO requested by radio an ambulance & an investigation at the scene & upon returning to Officer Hoffman RO went to assistance of subject on ground, as Officer Hoffman was with a subject that was sitting on left front seat behind wheel that was also injured. This subject later identified as Darlene E. Ferrin, WF, 19, of 864 Beechwood.
On preliminary examination of Mageau, it was apparent he had been shot a number of times, he had blood all over his face & blood coming from his mouth as well as his left leg with blood. RO felt it was necessary to question subject inspight of the fact the subject was in great pain. Subject was coherent & RO asked him, "do you know who shot you?" and he replied "no". RO then asked Mageau to give me some type of description & he replied that he can't. RO then asked a series of questions & was told by Mageau that the responsible was a white male, young & heavyset by himself & that he was in a brown vehicle. Questioning continued until the arrival of the ambulance. By this time Sgt's Rust, Lynch and Odiorne had arrived at the scene & RO gave them the information from the victim & gave a description over the air to all units' Michael Mageau also told Officer Hoffman that the perpetrator was last seen heading in the direction of Springs Road and Vallejo.
By 12.20 am a rudimentary description of the perpetrator, his vehicle, and direction of travel had been given to all units, who likely scoured the area of Springs Road towards Vallejo. The killer couldn't be certain his vehicle wasn't spotted leaving the Blue Rock Springs parking lot and couldn't be certain that both Darlene Ferrin and Michael Mageau were dead, despite his proclamation in the 12.40 am payphone call to police dispatcher Nancy Slover. With multiple units searching for a description of the vehicle, how likely is it that, the killer parked his car outside Joe's Union gas station and made a telephone call to the operator and Vallejo Police Department - a police station situated in extremely close proximity to the payphone. He may have been under the impression that his crime had not been discovered at this juncture, but would it have been the sensible option to remain in his vehicle, with possibly blood transfer on his clothing and the gun still in his possession. If the killer did not have a residence nearby, then he had either driven around or parked up somewhere from midnight to 12.40 am- all while a police search of the area is unfolding around him. There is, however, a new and compelling argument to be had, that may dispel the idea of a killer making a payphone call while in the presence of his vehicle- and can be found in the police report and August 4th 1969 'Debut of Zodiac' letter.
'7-5-69 A call received at 12.40 AM by unknown citizen "I want to report a double murder. If you will go 1 mile east on Columbus Parkway to the public park, you will find the kids in a brown car. They were shot with a 9 mm Luger. I also killed those kids last year. Good-Bye"
'12.47 AM Mrs Johnson PT&T operator called. The above call was traced to a coin-operated telephone at Joe's Union, Tuolumne and Springs Road. The call was traced by Betty MAIN whose supervisor would not allow her to give a statement at this time.'
This is the recollection of Nancy Slover in the 2007 Zodiac documentary, describing the latter part of the telephone call:
'But he said something like goodbye (drawn out in nature) and he hangs up, and I'm just kind of sitting there thinking "Oh my God."'
Here is part of Zodiac's August 4th 1969 'Debut' letter:
'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.'
These four sections of text should be enough to pour huge doubt on a killer making a telephone call to police, having driven to the payphone in a "brown car." Further bolstering the idea of a killer on foot, who lived nearby.
The Zodiac Killer, in his own words, places his vehicle right next to the payphone. He corroborates this using the 'negro male', who spotted him and his vehicle when the phone rang as he hung it up. If the Zodiac Killer is in his vehicle as he claimed, it is highly doubtful that once he replaced the receiver he perched himself alongside his vehicle and smoked a cigarette for several minutes, with an eyewitness clocking him and his vehicle. He would have "hung the phone up," returned to his vehicle immediately and driven away. This sequence of events couldn't have taken much longer than 10 seconds.
Police dispatcher Nancy Slover, once the Zodiac Killer had hung up, contemplated the gravity of what she had just heard, likely finishing off writing details of the call, "kind of sitting there thinking "Oh my God." She then had to reconnect to the operator to discover the origin of the call - who would then have traced the call to Joe's Union on Springs and Tuolumne.
'Ringback' would have been used to 'dial' back to this payphone, thereby making it ring. Unless this sequence of events could be accomplished in less than 10 seconds using the technology of 1969, the Zodiac Killer would never have heard the phone ringing. He would have returned to his vehicle and been long gone. The ringing payphone was never reported in any newspapers, so the Zodiac Killer had to be within audible range to know of this occurrence.
Nancy Slover received the phone call at 12.40 am, and the Zodiac spoke for approximately 30 seconds. The call would surely have ended before 12.41 am, yet, Mrs Johnson (PT&T operator) didn't get back to police, stating the call had been traced, until 12.47 am. That is just over 6 minutes later. If the trace and 'ringback' had occurred almost immediately (in under 10 seconds), why, bearing in mind the gravity of the murderous phone call, did it take 6 minutes to relay this crucial information to police.
The Zodiac Killer would have rang the operator that morning and asked for the Vallejo Police Department- hence their ability to 'trace' the call. But, once the Zodiac Killer had 'hung the phone up', is it possible that Nancy Slover could finish up her written record of the call, sit there briefly, thinking "Oh my God," contact the PT&T operator, who then facilitated a trace on the call, and rang the Joe's Union payphone inside of the time it takes for Zodiac to reach his vehicle and drive away.
If the 'ringback' took as little as 30-60 seconds, then it's highly likely the Zodiac Killer heard the payphone ring as he was walking away from the Springs Road and Tuolumne Street intersection on his way home.
The 40-45, rather shabbily dressed, negro male now becomes the perfectly described eyewitness, who saw Zodiac in his "brown car by the payphone." What a helpful guy.