A file on the 19-year-old man, who was questioned at Sundrive Road Garda Station, is being sent to the Director of Public Prosecutions.
A 15-year-old boy remains in custody at Crumlin Garda Station.
Marius Szwajkos died in hospital after being stabbed in the head with a screwdriver.
A second Polish man who was also attacked by a group of teenagers on Benbulben Road on Saturday remains in hospital.



















