Monaco Prince Albert Mourns Cousin Antoine de Massy, Found Dead at 29

Key points

• Antoine de Massy, 29, was discovered deceased in a garden behind Villa Sauber, a cultural landmark in Monaco, on the night of October 25.
• The alarm was raised when a relative noticed he missed a family lunch and contacted Monaco’s Public Security department.
• Prosecutor General Stéphane Thibault confirmed an investigation was opened to determine the cause of death.
• Security camera footage led investigators to a person who had been near the scene; this individual was arrested on Monday morning.
• The Prince’s Palace issued a statement expressing sadness and condolences, noting Antoine’s passion for tennis and his family’s deep ties to the sport.
• Antoine was the grandson of Princess Antoinette, the elder sister of the late Prince Rainier III, making him a first cousin once removed to Prince Albert II.

Background

Antoine de Massy belonged to a family with a long history in Monegasque tennis. His grandfather, Alexandre-Athenase Noghès, was a tennis player, and his aunt, Elizabeth-Ann de Massy, led the Monte-Carlo Country Club and the Monegasque Tennis Federation until her death in 2020. Her daughter, Mélanie-Antoinette de Massy, currently heads these institutions and the Rolex Monte-Carlo Masters. Antoine began playing tennis at age three and later moved to Florida for intensive training, expressing ambitions to represent Monaco at the Olympic Games. This tragedy follows other high-profile deaths in sports and royal circles, including the recent passing of former Kansas City Chiefs defensive end Allen Bailey and AEW wrestler Pac, though those cases involved different circumstances.

How outlets are covering it

Monaco-Matin and Town & Country Magazine reported that a family member’s concern over a missed lunch triggered the search. Monaco Life provided additional detail, noting that Prosecutor General Stéphane Thibault stated the investigation’s legal framework was modified after footage showed a man approaching Antoine while he was still on the boulevard. The Telegraph source was inaccessible due to a security block. All outlets agreed that the cause of death and the role of the detained individual remain unconfirmed, with officials considering all possibilities, including accident.

Why it matters

The death of a member of the princely family has placed Monaco in mourning and triggered a high-profile investigation. The involvement of security footage and the immediate custody of an individual suggest a serious inquiry into the circumstances surrounding the death. The case also highlights the close ties between Monaco’s royal family and the nation’s tennis institutions, a legacy that continues through Antoine’s relatives.

What to watch

The investigation will continue as authorities interview the detained individual and review technical evidence. The prosecutor has extended custody by 24 hours to allow for further questioning. The cause of death has not yet been disclosed, and the role of the detained person remains unclear. The Prince’s Palace has expressed its condolences, and the family is expected to receive support from the principality’s institutions.