Skull fracture

When JonBenet was found, nobody noticed any injury to her head. However, during the autopsy, it was revealed that she had a skull fracture.

Description from the Autopsy
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Dr Rorke's Analysis
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Surface-strike Theory
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The Flashlight
Experiments

The Golf Club
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The Baseball Bat
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Level of Force Required
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Sequencing of the Injuries
See Sequencing of the Injuries.