Overview
- Antoine de Massy, 29, was found dead in a green area along Boulevard du Larvotto after a fall first reported on 25 October 2026.
- Authorities have detained a 42‑year‑old man, who was charged by a judge with negligent homicide and failure to render assistance and placed in pre‑trial detention.
- The public prosecutor and forensic teams say autopsy work and technical analyses are ongoing and investigators have not yet established the full circumstances of the fall.
- Baron Christian de Massy, the victim’s father, publicly rejected the ideas that the death was an accident or suicide and the Princely Family held a wake and a funeral in Monaco on 4 November.
- The case has drawn intense local attention because Antoine belonged to a collateral Grimaldi branch and the unresolved questions could prompt further scrutiny of public safety and investigative findings in the small principality.