A fourth person has been arrested after last month's gangland shooting in Finglas.
Dissident republican Vincent Ryan died in the attack.
Gardaí arrested a man in his 30's yesterday afternoon. He's being held at Blanchardstown Garda Station.
Three men are now in custody in connection with the investigation, after one was released without charge.
25 year-old, Vincent Ryan, was shot several times while sitting in his car on McKee Road on February 29th.
Gardai have renewed their appeal for information.
