Gardaí in Dublin are questioning four people in connection with the murder of a Lithuanian man in Blanchardstwon last year.
The body of 31-year-old Paulus Bilys was found at a house at Pheasants Run in Clonee on June 25 last year.
A post mortem revealed he had died from head injuries.
Three men - aged 31, 26 and 24 - and a 32-year-old woman were arrested in north Dublin this morning as part of the murder probe.
The four, who are believed to be from Lithuania, are being questioned at Finglas and Blanchardstown garda stations under Section 4 of the Criminal Justice Act.