Shocking Revelations behind Joan Rivers Death

Several clinic workers told investigators that the August 28 appointment began with Rivers' personal throat doctor, Dr. Gwen Korovin, performing a laryngoscopy, which involves using a device to view a patient's vocal folds, a source close to the investigation told CNN last month.

Gastroenterologist Dr. Lawrence Cohen, who was the medical director of the clinic until resigning after Rivers' death, then performed an endoscopy intended to diagnose why she was suffering a sore throat and hoarseness, the source said.

Cohen detected something of concern, the source said.

Korovin then began a second laryngoscopy to again view River's vocal cords, the source said. It was at that time that her vocal cords began to swell, leading to a cutoff of oxygen to her lungs and ultimately to cardiac arrest, according to the source.

Korovin was authorized only to observe Cohen, who performed the procedure, since she was not certified by Yorkville Endoscopy clinic, as required by New York health law, the source said.

Investigators have found no prior consent form signed by Rivers authorizing a procedure by Korovin, the source said. It was unclear if Rivers had given verbal consent to the biopsy before being sedated.

But Korovin denied "performing an unauthorized procedure" before the comedian suffered cardiac arrest, a source close to the doctor told CNN last month.

Paramedics rushed Rivers from the clinic to New York's Mount Sinai Hospital a mile away, where she was kept on life support until she died a week later. Get more details here

Source: CNN

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