Prince Albert of Monaco and Princess Charlene have expressed sadness over the death of their cousin, Antoine de Massy, at 29. Police are looking into the circumstances. The royal couple has not given more details. Antoine de Massy was a well-known figure in the royal family and supported many charities. His death has surprised people in Monaco. The investigation continues. The royal couple is mourning the loss of their cousin. Antoine de Massy was a beloved member of the royal family. The circumstances surrounding his death are still under investigation. The royal couple has not provided any additional information. Antoine de Massy was known for his charitable work. People in Monaco are surprised by the news. The investigation into his death is ongoing.