The Northern Ireland Prison Service confirmed that investigations have been launched by the PSNI, the Coroner and the Prisoner Ombudsman.

Ronnie Armour, head of the Prison Service, said: “I would like to extend my sympathy and that of the Northern Ireland Prison Service to the family of the man who has died in Maghaberry this morning.

“My thoughts are with them at this difficult time.”

There were six reported deaths in Northern Ireland prisons last year.

Clare Bailey MLA, former member of the justice committee, said: “While the details surrounding the death of this man are just emerging, it is very clear that our prison service is under great pressure. This is having a significant impact on prisoners and prison office staff.

“Again, it brings home the reality that the DUP and Sinn Féin are failing the people of Northern Ireland.

“We need an Executive and Assembly in place to deal with the difficult but crucial issues like the much needed reform of our Prison Service.”