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Los Angeles - Joan Rivers' preliminary post-mortem results have been deemed inconclusive.
The New York Medical Examiner's Office have completed a physical examination of the body of the Fashion Police host, who died on Thursday after being placed in a medically-induced coma after she suffered a cardiac arrest during a routine operation on her vocal cords, but could not find a clear "cause and manner of death".
A source told gossip website TMZ.com that further tests will be carried out on the 81-year-old star's remains to determine exactly how she died, including toxicology testing.
The comedienne's medical team will also be interviewed about the throat procedure she was undergoing when she stopped breathing on 28 August.
Joan's only daughter Melissa Rivers, 41, confirmed her death in a statement on Thursday, saying: "It is with great sadness that I announce the death of my mother, Joan Rivers. She passed peacefully at 1:17pm surrounded by family and close friends. My son and I would like to thank the doctors, nurses, and staff of Mount Sinai Hospital for the amazing care they provided for my mother.'
A private funeral were held on Sunday at Temple Emanu-El in Manhattan.
