Imane Fadil, 34, died March 1 at a Milan hospital, where she had been treated since January 29 exhibiting "symptoms of poisoning", Milan prosecutor Francesco Greco said, according to Italian news agency ANSA.
Italian police are investigating the death of Moroccan-born model Imane Fidal - who was a regular guest at Italy's former prime minister Silvio Berlusconi's "bunga bunga" parties.
In 2012, Fadil testified at Berlusconi's trial, in which he was accused of paying for sex with an underage prostitute.
Berlusconi was initially convicted in the case but ultimately acquitted after a judge ruled he could not have known the underage prostitute was in fact a minor. He was later convicted of tax fraud and sentenced to carry out community service.
Berlusconi told the BBC: 'It's always a pity when a young person dies.
He added: 'What I read of her statements made me think that everything was invented, absurd'.
Mr Berlusconi - who has served as prime minister in four governments - is still facing a number of charges, including bribing.
She was admitted to hospital a month ago, telling her lawyer and brother she feared she had been poisoned.
"The doctors have not identified with any certainty any pathology which can explain the death".
According to Italy's Corriere della Sera daily, the hospital had run a battery of tests to determine the cause of her failing health, but finding nothing, had sent off samples to a specialised laboratory in the northern town of Pavia.
This has not been confirmed by Italian prosecutors.
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".
Mr Berlusconi's reputation was tarnished by allegations about the parties at his private villa. He also insisted that Ruby, who was 17 when she attended his parties, told him she was 24 years old.
Le mercredi dernier, de milliers d'enseignants mobilisant leurs élèves ont manifesté contre le prolongement des élections. A la fin des cortèges à la tombée de la nuit, des dizaines de jeunes, armés de sacs poubelles, ont nettoyé les rues .
Ajax last won the Champions League in 1995, while Manchester United last won in 2008 and Juventus most recently won in 1996. The Champions League hasn't had a different victor since Barcelona claimed the title in 2015.
The Emma Lavelle-trained 7-year old came home ahead of 33-to-1 chance Sam Spinner, with Faugheen third at a price of 4-to-1. He's good, so let's enjoy him over hurdles and he's only seven. 'But I keep stressing, this is not just me here.
Denver Public Schools was one of many school districts that canceled school because of poor road conditions and power outages. Residents were being urged to stay off the roads during the duration of the storm, CBS Denver reported .
News24 reported that Tropical Storm Dineo, with winds in excess of 166km/h, hit Mozambique in February previous year . However, at its peak intensity, it could reach the equivalent of a Category 4 or even a 5 hurricane.
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