According to Coweta County Coroner Richard Hawk, Bernecker died at Atlanta Medical Centre of blunt force trauma due to his fall on set.
He was reportedly placed on a ventilator after the accident, which was turned off on Thursday.
He was rushed to hospital by the air ambulance after reportedly falling 20 feet from a platform onto a concrete floor.
It was said that he was rehearsing a fight scene for the zombie series which was meant to end in a routine fall from a balcony.Related articles
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Unfortunately Bernecker lost his footing and fell from the raised platform.
AMC announced that they had shut down production of the series' eight run in the wake of the incident.
They issued a statement on Thursday which read: "We are saddened