Investigations are underway after a prisoner died at Magilligan in Co Londonderry.
A spokesperson for the Prison Service said the 27-year-old was found dead in his cell on Friday morning. His next of kin have been informed.
The PSNI, coroner and Prisoner Ombudsman have launched investigations, as is standard procedure.
Ronnie Armour, Head of the Northern Ireland Prison Service said: "I would like to extend my sympathy and that of the Northern Ireland Prison Service to the family of the prisoner.
“My thoughts are with them at this difficult time."