Gardaí have today arrested a man in connection with the killing of an 18-year-old man in Dundalk in Co Louth last month.
Champion kickboxer Niall Dorr died in hospital after suffering serious head injuries in a row involving several people.
As part of the investigation, gardaí arrested a 23-year-old man in the Dundalk area.
He is being questioned at Dundalk garda station under section 4 of the Criminal Justice Act.
It brings to five the number of people questioned in connection with the investigation to date.