The 39-year-old, a prisoner within HMP Barlinnie, died on 22 March 2024.
Mr Masson was in legal custody and in the care of the state at the time of his death.
The Crown Office and Procurator Fiscal Service is obliged to investigate such deaths, and a Fatal Accident Inquiry is mandatory.
A Preliminary Hearing will be held on 21 October 2026 at Glasgow Sheriff Court.
The purpose of a Fatal Accident Inquiry (FAI) includes determining the cause of death; the circumstances in which the death occurred; and to establish what steps, if any, could have been taken to minimise the risk of future deaths in similar circumstances.
Unlike criminal proceedings, FAIs are inquisitorial in nature, and are used to establish facts rather than to apportion blame.
This Inquiry will explore the circumstances of Mr Masson’s death, with particular focus on healthcare and medication management, substance misuse controls, clinical governance, and the emergency response to Mr Masson's death.
Andy Shanks of the Crown Office and Procurator Fiscal Service, Scotland’s death investigation authority, said:
“The Lord Advocate considers that the death of Christopher Masson occurred whilst he was in legal custody and as such a Fatal Accident Inquiry is mandatory.
“The lodging of the First Notice enables FAI proceedings to commence under the direction of the Sheriff.”
Further information
For more information on Fatal Accident Inquiries see the Crown’s guide.