A prisoner has died in custody at Magilligan Prison in Co Londonderry.
The man, who was 62, passed away in hospital on Friday, the Prison Service confirmed.
His next of kin have been informed.
Ronnie Armour, Director General of the Prison Service, said: "On behalf of the Northern Ireland Prison Service, I would like to extend my sympathy to the family of the prisoner.’’
A statement added that the PSNI, coroner and prisoner ombudsman have been notified, “as is standard procedure”.