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A man has been remanded in custody, but investigators have not established how Antoine de Massy fell to his death.
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A 42-year-old Ukrainian man was placed under formal investigation in Monaco on Wednesday 28 October 2026 and remanded in custody over the death of Antoine de Massy, a relative of Prince Albert II. Monaco’s prosecutor general, Stéphane Thibault, said the man was suspected of involuntary manslaughter and failing to assist a person in danger.
De Massy, 29, was found dead on Sunday in a square near Monaco’s Larvotto district. He was a grandson of Princess Antoinette, the elder sister of Albert’s father, Prince Rainier III.
Thibault said an autopsy suggested De Massy had probably died after falling about 13 metres from Boulevard du Larvotto. Investigators have yet to establish how he fell. Prosecutors have not specified what actions they allege the suspect took, and said the two suspected offences may relate to different points in time.
The man disputed the allegations during police questioning and has so far declined to answer the investigating judge’s questions, according to prosecutors. Earlier in the inquiry, prosecutors said an accident had not been ruled out.
4 listed sources · explore evidence, limitations and provenance.
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