The umbrella man fired the dart that paralyzed JFK but Jackie fired the kill shot
Shot entered his head from the left rear of his head. After Jackie fired her Derringer the casing was ejected onto the trunk lid of the Lincoln so she had to climb out to retrieve it
People get way too wrapped up in the subtle movement of the head
Hello……the front right of his head explodes outwards which points pretty damn convincingly to a shot from the rear left