Gardaí in Carlow Town are investigating the unexplained death of a man in his 40s.
Officers were alerted to a house at New Oak estate shortly after 3.30am after he was found unresponsive by emergency services.
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He was treated at the scene but died a short time later.
The man's body has been taken to the mortuary at University Hospital Waterford where a post-mortem will take place.
The results will determine the course of the investigation.