The back of Paul Stine's shirt shown here also shows a distinct separation, with the majority of blood on the right side, with very little blood patterning on the left, in direct contrast to the front of the shirt, which shows equal amounts of blood on both sides down to the first blue line. However, at the first blue line it stops abruptly on the left side, yet continues on the right side despite there being almost equal amounts of blood above this.
Greater blood transference from a right-sided head wound should produce increased staining to the right side of the shirt if the victim is perfectly upright, but if you take a look at the collar of the shirt (marked C on the diagram), the staining is extremely high on the left side as well. This high left-sided staining, along with the majority of the blood being on the right rear side of the shirt as opposed to the left, considering the near equal distribution on the front - and the blood stopping abruptly on the front left side of the shirt, can all be explained in one simple scenario, as well as the two small patches of blood marked A and B on the left and right armpit area of the shirt. Only one sitting position can explain all these blood patterns and point to a Washington and Maple murder. And later, blood marks on the handle of the door will hopefully be the final piece of the jigsaw. The following is a quick refresher to lead us into the final part of the story
The killer believed his task was complete. but Paul Stine's foot had broken contact with the vehicle's brake pedal and the taxicab was now motioning forward out of control. In an instant the killer had to react to prevent an imminent crash, alerting the neighborhood and drawing unwanted attention to himself. We may never know if his intention at this point was to preserve his master plan of securing a section of Paul Stine's shirt and was not to be denied - or having possibly used a silencer, was determined not to place in jeopardy his quiet exit away up Maple Street to his waiting vehicle somewhere close by. Whatever the case, he had to make his decision now.
The Zodiac Killer hastily exited the left rear door of the moving vehicle, possibly injuring himself in the process (Donald Fouke described a man later spotted on Jackson Street as having a shuffling lope, like a semi-limp) and entered the front driver side door. In doing so, he then deposited blooded fingerprints on the dividing panel between the front and rear door. Then bracing himself on the front driver side compartment area, stepped over the lifeless body of Paul Stine to gain some limited control over the runaway vehicle. He now had to support Paul Stine's body in an upright position, pressing it against the driver side door with his left side, so as to access the taxicab pedals with his left foot and coast the taxicab away from the Washington and Maple Street intersection to the corner of Washington and Cherry, where it was found positioned in the above photograph.
The journey from Washington and Maple Street to Washington and Cherry Street begins. The blood runs down and outwards around the chest, but because Paul Stine is tilted slightly to the left, blood from the right side runs around the neck to the collar on the left side and down this side of the body, as well as the right. As he is pushed against by the Zodiac, the right side of his back lifts marginally away from the seat allowing blood to stain the right rear section of his shirt, but leaving his back left side virtually untouched, as this is pressed firmly into the seat, thereby preventing the blood from reaching this area. Paul Stine's arms are squeezed in at the armpits, meaning the red circled areas in the upper photograph are blood free. The shirt arms have two distinct patches (A and B), which slightly touch the blood as it rounds the chest.
The blood continues downwards staining the shirt as it goes, but stops almost linearly on the left side, two-thirds of the way down - and exactly where the arm rest of the door is positioned. With Paul Stine's body pressed firmly against this door rest the blood is prevented from reaching the lower portion of the shirt on the left side, where it gets channeled away, however, it pools slightly in this area. You will notice in the above photograph the streaks of vertical blood highlighted on the arm rest.
When the Zodiac Killer brings the taxicab to rest at the Washington and Cherry Street intersection, he shuffles over to the right side of the front seat and pulls Paul Stine's body away from the left door and arm rest into a lying position to secure his trophy. The blood streak across the arm rest now is subject to gravity and forms the patterned blood striations downwards, depicted in the photograph above. This is not blood spatter from the initial shooting, as the rest of the door remains untouched. The Zodiac Killer is spotted by three teenagers from the house opposite in the mid to right of the front passenger seat, in all likelihood removing the rear section of Paul Stine's shirt. He then likely pushes Paul Stine's lifeless body over to the floorboard section of the front passenger seat, where heavy blood pooling is noticed in the crime scene photographs. The final resting position of Paul Stine is partially hanging out of the car door, almost certainly pulled into that position by the attending medical crew.
The time period between the two intersections allows for the blood pattern to form on the shirt, something that is simply not feasible if Paul Stine had been killed at Washington and Cherry and had slumped over immediately. More importantly, no audible gunshot was ever heard by the three teenagers across the street, with the blooded prints on the external driver side door simply not explainable if the order of events had unfolded as we were led to believe.