Gardaí in Dublin have released one of three men being questioned about the murder of Stephen O'Halloran in the Tallaght area earlier this year.
The 20-year-old was shot dead while sitting in a car in the driveway of his home in Kilmartin Drive in January.
Two men aged 18 and 20 were detained on Wednesday in connection with the shooting, while a 19-year-old man was also arrested yesterday.
The 20-year-old has been released without charge and the other two remain in custody this morning.