A man in his 40s has been arrested in connection with the death of an inmate at Wheatfield Prison in Dublin on Thursday.
The man is detained in a Garda station in Dublin, with investigations continuing, gardaí said.
The deceased inmate was named locally as Brendan Gahan (39), from Tallaght, who was serving a sentence for possession of drugs for sale or supply.
The investigation began after Gahan died in his cell shortly before midnight on Thursday after an alleged assault.
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He was sharing the cell with another inmate.
Gahan was serving a sentence of three years and nine months. He was sentenced in Dublin in February after pleading guilty to two counts of possession of drugs for sale or supply.
