Member of a bagpipe ensemble perform as members of the media and fans watch mourners depart the funeral of comedian Joan Rivers at Temple Emanu-El in New York September 7, 2014.
Member of a bagpipe ensemble perform as members of the media and fans watch mourners depart the funeral of comedian Joan Rivers at Temple Emanu-El in New York September 7, 2014. REUTERS/Lucas Jackson

Even one month after the tragic event, the question has still haunted her fans: How did Joan Rivers die? But at last, the cause of death is now public, as the New York City Office of Chief Medical Examiner revealed, according to FOX411 on Thursday. Rivers lacked sufficient oxygen supply to her brain for a long time, which resulted in brain damage. Her heart had stopped after she was sedated with propofol and had been going through procedures to examine her condition.

At the New York City clinic, she suffered a cardiac arrest and had to be rushed to Mount Sinai Hospital in order to be put on life support. She died some time later. The medical examiner's office said it found no obvious medical error and that the manner of death was "therapeutic complication," indicating that death is an accepted possibility of the procedure she was undergoing. He also called it a "predictable complication," according to TMZ, which seems to indicate that the Examiner is calling it a risk associated with either anesthesia, the procedure, or both.

The State Department of Health had been probing into Yorkville Endoscopy after she died. It had some issues with its medical director, Dr. Lawrence Cohen, shortly after the star died there. The New York State Health Department continues with the probing of the clinic where she had been treated. However, no one suspected that anything wrong had been done, and the probe was routine.

Her daughter, Melissa Rivers, told ABC News: "We continue to be saddened by our tragic loss and grateful for the enormous outpouring of love and support from around the world. We have no further comment at this time." She added that her mother always wanted to make everyone laugh, and would want that all her fans should return to laughter and happiness. Rivers is remembered for her contribution to all comics, especially for women.

Her raspy voice with the brash New York accent helped to make her a well-known TV talk show host, stage, film and TV actress, author, fashion critic, and start a famous line of jewellery. In her book, she had joked that dying of natural causes was boring. "It's the grand finale, act three, the eleven o'clock number - make it count. If you're going to die, die interesting! Is there anything worse than a boring death? I think not," she said, according to Fox9.