A man in his 30s has been charged in connection with the fatal assault at a house in Swinford on Monday night.
The man was charged overnight and is due to appear before Castlebar District Court this morning.
The victim has been named locally as Michael McDonagh from Knock, who was in 20's.
A post-mortem examination was carried out on the deceased at Mayo University Hospital yesterday.
Midwest News understands he will be laid to rest in Knock later this week.