John,
Do you believe the fatal head shot came from the front?
-- MWT 
No, all 3 shots came from behind because that's what the autopsy photos indicate, the bullet fragments which had to have come from the head wound were found in the Limo came from Oswald's rifle, about 95% of the eyewitnesses didn't describe any cross-fire, a bullet does not have the kinetic energy to drive any body any significant distance and having a frontal shooter potentially being seen or bullet direction being traced makes the whole idea nonsense, imo.
JohnM