The two men arrested in relation to the death of Joseph Deacy have been released without charge.
Two men in their 20s are still being questioned in Mayo in connection with the death of Joseph Deacy.
The 21-year-old from St Albans in England died in hospital August 13.
He had been found with serious head injuries outside a house in Gortnasillagh near Swinford.
The men - who are both in their 20s - are being held under Section 4 of the Criminal Justice Act at garda stations in Co Mayo.