A Hong Kong family may yet get justice for the death of Sandra d'Auriol, a mother of three and businesswoman who plunged to her death nearly two years ago. US investigators say a police probe into the death of d'Auriol at 53 remains active despite the case dragging on for 21 months, but the family say they have been left in the dark. The jewellery designer and philanthropist fell from the rooftop of a medical clinic in California after 13 hours of surgery. Lieutenant Lincoln Hoshino, a spokesman for the Beverly Hills Police Department in that US state, told the Sunday Morning Post : "The case is still open. We are still waiting for the final report from the coroner." The report, released to the family in July, confirmed their suspicions. Her death was due to a drug/anaesthesia-related accident rather than suicide. At the time, d'Auriol was in a state of "post-operation psychosis clinical", also known as post-operative neurobehavioural disturbance (POND) - or delirium. Reacting to the latest update, family spokesman and brother-in-law Guy d'Auriol said: "We were unaware that the [Beverly Hills] police are continuing to investigate this matter. We have not been made aware of any new finding which may have motivated them to keep the file open. "Obviously the action going forward is in the hands of the [Beverly Hills] Police Department and we look forward to hearing from them when their investigation is concluded." Since d'Auriol's death, the family have launched a campaign to raise the profile of her condition, launching a website called POND Awareness. Experts believe one in three people who undergo surgery suffers from the condition in one form or another. The brother-in-law told the Post last week he had no intention to sue the surgeon at the heart of the police investigation - who could not be contacted for comment by the Post . D'Auriol said the family had suffered enough.