ABC News is reporting that the Yorkville Endoscopy's medical director Dr. Lawrence Cohen has been fired following the throat procedure that led to Joan Rivers' tragic death. The comedian stopped breathing while undergoing an outpatient surgery on her vocal cords and later passed away at the age of 81. Sources at the clinic told TMZ that Dr. Cohen stepped down after the board asked him to do so. The New York Department of Health is also currently investigating the matter. We will keep you posted as the story develops..