Gardaí at Ronanstown say they continue to investigate all the circumstances surrounding the death of a prisoner at Cloverhill Prison on Saturday, October 5.
The man (30s) arrested in relation to this investigation has been released without charge, from detention under Section 4 of the Criminal Justice Act 1984.
A file will be prepared for the Director of Public Prosecutions (DPP).
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Gardai say investigations are ongoing.