Italian magistrates said on Friday (March 15) they had opened an investigation into possible murder after the mysterious death of a Moroccan model who was a regular guest at former prime minister Silvio Berlusconi's "bunga bunga " parties.
Ms Fadil was a central witness to the prosecution in 2012 against Berlusconi who was alleged to have paid for an underage prostitute.
Ms Fadil was writing a book about her experiences and magistrates investigating her death have obtained a copy of the manuscript, Italian newspapers report.
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However, according to Italian news agency Ansa, toxicological tests revealed that she had died of a "mix of radioactive substances".
Mr Berlusconi was initially convicted but then acquitted on appeal. He was later convicted of tax fraud and sentenced to carry out community service. I never met this person, never talked to her'.
Mr Berlusconi - who has served as prime minister in four governments - is still facing a number of charges, including bribing.More news: Erdogan Confirms New Zealand Shooting Suspect Visited Turkey Twice
Fadil was taken to hospital on 29 January with severe stomach pains that had caused her to vomit; she reportedly told her friends and lawyers that she had been poisoned.
"The doctors have not identified with any certainty any pathology which can explain the death".
Francesco Greco, Milan's chief prosecutor, told Reuters: "Initial medical record checks suggest some form of poisoning so we are having a full autopsy performed".More news: Australian senator blames immigrants for mosque attacks
The former model first hit the headlines in 2012 when she gave detailed testimony about the goings on at Berlusconi's orgiastic parties at his villa in Arcore near Milan.
Back in May 2010, a 17-year-old exotic nightclub dancer, Karima "Ruby" El Mahroug, left police custody in Milan after Prime Minister Silvio Berlusconi called surprised officials to say that the teen should be released because she was the granddaughter of the Egyptian president.More news: Cyclone Idai could put 'tens of thousands' Mozambicans in danger