Detectives investigating the murder of a man have arrested a second man within a week.
Dean Johnston, 20, was shot dead as he sat in the back of a car outside the home of his best friend in Moorefield Avenue in Neilstown, west Dublin, on May 25 last year.
Gardai said they arrested a man in his mid 40s in Clondalkin.
He is being held at Ronanstown Garda station under section 30 of the Offences Against the State Act.
A 23-year-old man arrested in Co Wexford on Monday remains in custody at Lucan Garda station, under section 50 of the Criminal Justice Act.
Mr Johnston was killed when a man walked up to his friend's VW Golf car and fired five shots from a handgun into a rear passenger window.
He was hit in the head and shoulder and was later pronounced dead at Tallaght Hospital.
Mr Johnston lived a few doors away from where the shooting happened.