The video showed a single shot being fired towards the Turning Point USA co-founder, as he reached his arms up to his neck, which had begun losing huge amounts of blood.
Anatomy teacher Josh Cottle has taken to Instagram to explain what would have been happening inside his body, in medical and scientific terms.
The science and health expert has a following of more than 269,000 on his account @scibodytherapy on social media, where he makes educational videos about the human body.
In his newest video, he showed a diagram of the human neck and head and explained what would happen if a bullet were to pass through there.
Cottle explained that the body ‘reacts particularly badly whenever a hole is produced by an object moving at super sonic speeds through an area where cable management is a top priority’.
He explained that the shooter may not have been targeting the neck – he was more likely to have been aiming for the chest or head, but had a ‘bullet drop’ or a ‘bit of drift’.
The anatomy expert added: “Either way, it went through the neck. And to the people saying if there had been an ambulance on this scene or he had gotten proper medical care, that the outcome would have been different – that is not the case.
“He could have been shot in an emergency room and the outcome would have been the same.”
An anatomy expert has explained exactly what was going on in Charlie Kirk’s body the moment he was fatally shot (Instagram/scibodytherapy)
He went on to reference the diagram and explain that the neck has external and internal jugular veins, which drain blood from the head back to the heart.
There are also common carotid arteries – ‘one of the four sources of blood that head to the brain, which has about a litre of blood flowing through it at any given minute’.
Meanwhile, the vertebral artery snakes its way up along the spine and heads into the skull, to the brain.
Cottle explained: “On the left side, you have half of the blood flow to the brain at any given time. This all means that severing these with anything is a big no-no in the user’s manual of the human body.
“Now I want you to forget about all that because this would only matter if there had been an arrow or a knife. In this instance we’re dealing with a high speed projectile and that means we need to talk about something called a temporary wound cavity.”
He outlined that the human body ‘is mostly water and soft tissue,’ before pulling up an animation that showed what happens when a ‘projectile contacts a substance like that’.
The anatomy teacher explained: “It causes basically a ballooning and swelling of the tissue as it moves through it.
“So as that bullet was passing through here it was causing a ballooning and violent expansion of all of this tissue. And that led to a complete obliteration or at least very severe damage to the connection between the spinal chord and the brain.”
He concluded: “And you can see evidence of this very clearly in the video because he enters into something called the decorticate posturing, where your arms involuntarily come up towards your chest.
“Many people mistook this for him trying to grab the wound, but you can see shortly after that that he just goes completely limp.
“There were also multiple angles of this and none of them indicated any kind of exit wound, which means all the energy from that projectile likely went directly into the spinal column.”