Two separate investigations are being carried out by the Garda and the Irish Prison Service following the death of a prisoner in Limerick Prison.
The man, aged in his 30s, was discovered unconscious in his cell at around 8pm last night.
Gardai said the circumstances suggested that foul play is not suspected.
However, a post mortem examination will be held today to determine the status of the Garda investigation.
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Investigations by the Garda and the Prison Service are routine following the death of a prisoner and are a statutory requirement.
Limerick Prison is a medium security facility which has 270 male and 20 female inmates from all over Munster.