This is not even comparable to the assassination attempt on Trump, where the guy fired multiple shots and missed. The person who killed Charlie knew what they were doing, aiming at the jugular artery, possibly a professional. The fact that they couldn't even find the person makes no sense. How long is it going to take for someone to escape the roof top and get away with it? Isn't US intelligence so good it can catch people doing crimes from different parts of country and even the world? If they don't catch the person it's because it WAS an inside job..
It's a .30-06 rifle round, any hit to the center upper torso is going to be the end. It looks like it hit him in the lower left neck/upper left chest which is right where the carotid and subclavian arteries are. Not toi mention proximity to the aorta. If it was the carotid with the amount of blood loss he would have near instantly lost blood pressure to his brain, then it's lights out. Spinal damage is possible too but that would be secondary. You saw him grip his fists and twist, then slump like someone with a brain injury, not go limp like a spinal. Apologies if this is too morbid.