Four people have been arrested in connection with the murder of Jamie Tighe Ennis in Dublin in October 2017.
All four are male and were arrested in the Dublin area.
Gardaí have said that one of those arrested is a juvenile, while the others arrested are aged in their 20s, 30s and 50s.
They are currently being detained in Coolock, Clontarf, Ballymun and Swords Garda Stations.
24-year-old Jamie Tighe Ennis from Artane was killed on 28 October last year.
He had been shot in the head as he was speaking to friends on Moatview Avenue in Coolock.
