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. Police are looking into the details of the incident. No further details have been released by the royal family. He supported many charities. His death has come as a shock to many in Monaco. The investigation into his death is ongoing.