The 'Inside Detective' Magazine from January 1969 stated "At the murder scene, drops of dried blood leading from the body to Terracina Street indicated to the detective that the murderer had walked back to the street following the slaying". This indicated that the killer was walking back to his vehicle, parked on Terracina Drive. But which way did he head, east or west? The Riverside City College library entrance was situated approximately 45 yards (135 feet) east of the alleyway where the slain girl was discovered. There are, as always, conflicting versions of the same event.
 The 'Inside Detective' Magazine stated "The Riverside Sheriff's Department picked up the broadcast. Minutes later, Sheriff's Detective Sergeant Jack Reid and Detective Jack Elms discovered the little car. It was parked at the curb in front of the college library about 75 feet (25 yards) from the entrance of the roadway where the girl's body was found".  Robert Graysmith, in his book Zodiac. stated "He probably came up and offered help, offered her a lift in his car. Then he got her to go down the unlit gravel road to the parking lot, about 75 yards east of her car".  The Riverside Police Department memorandum stated "She returned to her vehicle, which was parked on a city street a short distance from the library, placed her books in the vehicle, and attempted to start her vehicle, The vehicle had been tampered with so it would not start. This was evidently done by the suspect to keep the victim near her vehicle, so the suspect could make his approach. Our victim then left her vehicle, accompanied by the suspect, and walked approximately 200 feet (67 yards) into a dirt driveway between two houses".
Below I have interpreted the statements. One vehicle is placed between 67-75 yards west of the alleyway (which was "about 75 yards east of her car"). The second interpretation places the vehicle "in front of the college library" about 25 yards east of the alleyway. These appear the two options.
If her disabled Volkswagen Beetle was parked 70 yards west of the alleyway, then his statement in the 'Confession' letter of "When we were away from the library walking, I said it was about time. She asked me "about time for what." I said it was about time for her to die". makes it appear he is heading in the wrong direction. Considering the relative position of the Volkswagen Beetle (70 yards west) and the alleyway in this instance, he would have been walking towards the library, not away from the library. However, the Volkswagen Beetle being parked 25 yards east of the alleyway flies in the face of the Riverside Police Department memorandum, which indicated her vehicle was parked 200 feet (67 yards) from the alleyway. The Riverside Police Department memorandum and Robert Graysmith's book appear to corroborate one another in terms of distance from the alleyway.
One wouldn't have imagined parking spaces that difficult to find on a Sunday evening, particularly bearing in mind Cheri Jo Bates had arrived at the library around opening time, before many of the other 65 attendees. This may also challenge the notion of her parking her vehicle 120 yards (360 feet) from the library entrance, along Terracina Drive, leaving her an unnecessary distance to walk. This revamped assessment now places her vehicle approximately 75 yards east of the alleyway, very close to the library, and "parked at the curb in front of the college library". Or, "parked on a city street a short distance from the library". Not on the west side of the alleyway as originally believed.
But where was the assailant's vehicle parked? In the 'Confession' letter the author stated he "waited for her in the library and followed her out after about two minutes". We know that Cheri Jo Bates was not murdered until approximately 10:30 pm, so much of what the 'Confession' letter depicts is false, however, his wording can still give us a clue to the location of where his vehicle was parked. It is extremely likely the killer either trailed Cheri Jo Bates to the library that evening, or pulled up near to the library on the expectation of her arrival, maintaining a visual on the entrance. Regardless of what time she entered the library, or where she went that evening, the assailant would have parked somewhere on Terracina Drive to facilitate his plan, hence the wording on the 'Confession' letter: "I told her that my car was down the street and I would give her a lift home." and "when we were away from the library walking". This indicated his vehicle was parked west of the library entrance, towards the alleyway.
In the Robert Graysmith book it stated "A neighbor heard an 'awful scream' between 10:15 and 10:45 pm, and then about two minutes of silence, and finally the sound of an old car starting up". The neighbor's claim is backed up by the latter part of the 'Confession' letter: "She died hard. She squirmed and shook as I choked her, and her lips twitched. She let out a scream once and I kicked her head to shut her up. I plunged the knife into her and it broke. I then finished the job by cutting her throat". After Cheri Jo Bates screamed, according to the author, he kicked her and then used the knife twice to finally kill her. Taking this at less than 30 seconds, and assuming the killer and starting car are connected, what did the killer do for the remaining 90 odd seconds. If his vehicle was relatively close by (30 seconds journey) - so that the neighbor was able to hear it starting up - then we are probably looking for an unaccounted minute of time. Was this time used in searching for the Timex watch, wrenched off his wrist in the struggle with Cheri Jo Bates?
Based on everything learned, the Volkswagen Beetle of Cheri Jo Bates was likely parked very close to the library annex - 75 yards east, or thereabouts from the ill-fated alleyway. Her vehicle would have been parked approximately 30 yards (90 feet) east of the library entrance. The assailant's vehicle was also parked on Terracina Drive, within earshot of the alleyway, on either the east or west side. "At the murder scene, drops of dried blood leading from the body to Terracina Street indicated to the detective that the murderer had walked back to the street following the slaying". But only a matter of yards from the alleyway, before driving away.
"Some of her friends were at the library between 7 and 9 pm, but none can recall seeing Cheri. She had been there, however, because three books stamped that day were found in the front seat of her yellow-green Volkswagen found parked on Terracina, near the annex. Someone else was there too. Someone who police believe knew Cheri- knew her well enough to recognize her car. The distributor had been tampered with and there was evidence that the man had been in the car with her. The keys were still in the ignition when the car was found the next day. Both windows had been rolled down and the right door was ajar."