A 17-year-old shocked with a Taser by police after an altercation at a northern Charlotte grocery store died from cardiac arrest, according to an autopsy released Friday.

Darryl Wayne Turner's heart was pumping so fast and chaotically from the Taser shot and the stress of the confrontation that it stopped pumping blood properly.

Turner died of acute ventricular dysrhythmia and ventricular fibrillation, according to the Mecklenburg medical examiner's office.

Turner's death was the first Taser-related death in the Charlotte-Mecklenburg Police Department's history, and he was the youngest victim in the Carolinas this decade.

Police confronted an "agitated" Turner on March 20 during an argument with the manager of a Prosperity Church Road grocery store.

Police said Turner threw something at the manager, ignored commands and advanced toward Officer Jerry Dawson Jr., who used a Taser. Turner was struck in the chest, and he fell to the carpeted floor.

The autopsy found no relevant pre-existing conditions.