The man, who is understood to have been serving a sentence for manslaughter, was found at about 4.00am this morning.
The man who is understood to be originally from Co Tipperary; from initial investigations is believed to have died from a drugs overdose.
Following standard procedures members of an Garda Siochana together with the Prison Service, are now conducting separate investigations surrounding this man’s sudden and unexpected death.
A post mortem is expected to be carried out on his body later today and the Prison Service confirm that they will not be releasing the man’s name until all of his next of kin have been informed.
Go ndéana Dia trócaire ar a anam dílis.