A 42-year-old man has been charged with involuntary manslaughter and failure to assist a person in danger following the death of Antoine de Massy, Prince Albert II’s first cousin once removed, whose body was found in Monaco on Sunday evening.
The Ukrainian national, who has lived in Monaco for 30 years, was brought before an investigating judge on Wednesday 28th October and remanded in custody.
Monaco’s prosecutor general, Stéphane Thibault, said the man had denied the allegations during police questioning and had not wished to answer the investigating judge’s questions at that stage.
The charges concern alleged “acts that may have been committed at different times”, Thibault said in a statement issued to Monaco Life 1.30pm on Wednesday.
The charges do not allege an intentional killing. He is presumed innocent.
Investigation to establish what led to the fall
A formal judicial investigation has now been opened, placing inquiries under the authority of an investigating judge. Its purpose will be to establish “the precise sequence of events that led to Antoine de Massy’s fall”, Thibault said, through questioning of the accused, analysis and technical investigations.
The statement does not explain how the fall occurred or specify what actions the suspect is alleged to have taken.
Family raised the alarm on Sunday
Antoine, 29, was found dead on Sunday 25th October in a park below Boulevard du Larvotto after his family alerted the authorities and Monaco’s Public Security service began searching for him.
Police initially opened an investigation to establish the cause of death. According to the prosecutor’s office, investigators established that a man had approached Antoine while he was on Boulevard du Larvotto. The man was arrested on Monday morning, and his police custody was extended by 24 hours that evening as interviews and technical inquiries continued.
On Wednesday, he was formally charged and remanded in custody. An investigating judge will now oversee further inquiries into the circumstances of Antoine’s death. He remains presumed innocent.

Tributes near the site
A memorial has been set up near where Antoine’s body was found, with flowers, candles and a Monaco flag.
Tennis balls recall his passion for the sport, while a framed childhood photograph serves as a reminder of how young he was. Rose petals have been arranged in a heart around the tributes.
Palace expresses sadness
Antoine was the son of Baron Christian de Massy, Prince Albert’s first cousin, and Cécile Gelabale. His grandmother, Princess Antoinette, was Prince Rainier III’s elder sister and Prince Albert’s aunt.
In a communiqué issued on Monday, the Prince’s Palace said Prince Albert II and Princess Charlène had learned of his death “with sadness”.
“Passionate about tennis, he was part of a family history closely linked to the sport in the Principality,” the Palace said. “Their Highnesses share in the grief of his family and loved ones and extend their sincere condolences at this painful time.”
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Image of Antoine de Massy taken from his Instagram page





