Here's a link
It seems that Z planned on killing a cab driver. Insp.Toschi -and sorry to hear of his passing-through his friend Duffy told me that Z was in the front seat.They interviewed several taxi drivers and others that were in the area that night 10/11/69. Z had a 9 MM and if to be believed had a 'disguise' so this alone could indicate he was planning a murder. The fact he went through so much effort-gruesome as it was showing he was a psychopath- to tear a portion of Stine's shirt to later send with some of his missives as 'proof 'he was the Zodiac. Z took Stine's keys as well as his wallet shows intent. He did not seemingly have transportation close by, but we assume he did,again, showing planning. He may have had a car nearby the crime scene or even a MC for a faster getaway. He may have been wearing engineering boots as per one reference made by Sgt.Fouke.These are worn by many MC riders.He mentions 'MC cops' seeking him that night. FYI
Sending a letter 10/13/69 with crime details and a "blood stained:"piece of Stine's shirt seem to show at least to Z it was another murder he planned. And in the 11/9/69 letter he made references to this attack also as though it was a planned Z murder.