A law school grad and an (inactive) member of the bar in three states, Dr. John Dunn has been a lecturer in medical-legal matters for more than 35 years. He has followed the case from the beginning, studied the videos and reviewed the autopsy report. “Asphyxiation was not the cause of George Floyd’s death,” he tells me. “It was cardiac arrhythmia during an episode of excited delirium, a well-known cause of sudden death that was the subject of an extensive research project and monograph by the American College of Emergency Physicians, published in 2009.”