The 26 year old Doneraile man died after he was found unresponsive outside the Gleneagle Hotel in Killarney on the 29th of August.
Two men in their 20s and 40 who were arrested yesterday morning have been released without charge and file will now be prepared for the DPP.
It's believed Darragh died after he was caught in a headlock during an altercation.
The man arrested this morning is the fifth person to be arrested in relation to the investigation.
Two other men arrested on Tuesday have also been released with a file sent to the DPP
The man in his 30's who was arrested today is currently being detained at Killarney Garda Station
