The left arm has two entry wounds; one is medially located in the upper arm, 3 and 1/4 inches above the elbow and exiting the opposite side. The second entry wound is located medially on the forearm, 2 inches above the wrist, fracturing the radial and ulnar bones, and exiting above and laterally at 3 inches above the wrist.
 Bullet passes through posterior margin of the 10th/11th thoracic vertebrae, the liver and spleen, and is recovered at autopsy in the medial margin of left rib #9.
 Bullet passes through posterior axillary line of the 7th thoracic vertebra, right lung, left ventricle of heart, left lung, and exits body through left rib #7 near the mid-axillary line.
 Bullet passes through 4th rib, right lung, the anterior shaft of right 2nd rib, where it was recovered in the subcutaneous tissue at autopsy.
 Bullet passes through right shoulder, the anterior chest wall to the anterior margin of the sternum, level with 4th ribs, and exits the left side of the left breast, just above the nipple.
Michael Mageau was struck by 4 bullets. One was removed from his left thigh during surgery by Dr. Shirai. One bullet had exited his hip and was noted on the ground by his person when responding officers arrived at the crime scene. This had likely trapped in his clothing and fell to the floor when he exited the Corvair. The remaining 2 bullets exited his jaw and right shoulder (through skin), and struck Darlene Ferrin seated to his left. I suspect the bullet that struck Michael Mageau's right shoulder region was the bullet that created pathway  in the anatomy diagram above. While the one that struck his jaw region created pathway .
It cannot be claimed with certainty that Darlene Ferrin was targeted first that morning, but the coinciding bullet wounds to her right and left wrist, in addition to her vehicle being "primed" to drive away, could suggest an uneasiness in Darlene Ferrin caused by the approaching man at Blue Rock Springs. If the Zodiac Killer had suspected this, it would have made sense to target the driver first.
A WHISKER AWAY FROM ESCAPE