Robin Williams and Joan Rivers

Joan Rivers was pronounced dead at 1:17 p.m. Thursday at a NY hospital. Her daughter, Melissa Rivers, made the announcement just moments ago.

Rivers, 81, stopped breathing while undergoing a routine outpatient endoscopy procedure at a NY clinic on August 28. The clinic is now under investigation by NY state health officials. Rivers reportedly experienced laryngospasm (tightening of the larynx) which cut off oxygen to her brain during the outpatient procedure. Doctors don't know how long her brain was deprived of oxygen.

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Robin Williams and Joan Rivers

Comedian Joan Rivers was rushed to a NY area hospital where she is listed in stable condition after she stopped breathing while undergoing a routine endoscopic procedure at an outpatient clinic. An endoscope is a small, flexible tube with a camera and a light at the end of it. The endoscope is passed down a patient's throat by doctors who look for abnormalities (tumors, ulcers, etc.) in the patient's esophagus or the stomach.

Rivers, 81, is pictured above with the late Robin Williams.

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