Investigations are underway following the death of an inmate at Cloverhill Prison in Dublin.
It happened in the early hours of this morning.
Gardaí and emergency services were alerted to an incident within the prison shortly after 5:30 am.
They say a man in his 40's was injured.
He received medical treatment but was pronounced dead a short time later.
The scene remains preserved for a full forensic and technical examination and the services of the State Pathologist and Garda Technical Bureau have been requested.
The coroner has been notified and the services of the State Pathologist and Garda Technical Bureau have been requested.
A Garda Senior Investigating Officer (SIO) has been appointed to lead the investigation and a Family Liaison Officer (FLO) has been assigned to the family of the man.