Money quote:
The biggest problem with postulating a second shot to the head from the direction of the so-called grassy knoll area is that we cannot explain what happened to that bullet, and why there was no apparent damage to the left side or left rear of JFK's skull. If a bullet came from the right side, it is extremely difficult for me to explain how there would have been no damage to the left cerebral hemisphere, or any portion of the left side of the calvarium.
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A letter from Dr. Wecht to Sylvia Meagher on the head shot.