Over a month after Joan Rivers' death, the New York City Office of the Chief Medical Examiner has released the cause of the comedian's death. The 81-year-old went into pulmonary arrest during her throat procedure cutting off oxygen to her brain. The report also reveals the comedian was sedated with propoful during the procedure to evaluate changes in her voice and to deal with acid reflux. The medical examiner is calling it a 'predictable complication.' The New York State Department is still investigating the circumstances of the death..