Three men are being questioned about a murder in Clondalkin.
Twenty one year old Dean Johnson was shot dead near his home just over a year ago.
The victim was shot outside a house at Harelawn Green as he made his way home from a local pub on August 24 last year.
The suspected getaway car was set on fire at nearby Collinstown Crescent.
As part of the investigation into his murder, two men in their 20s were arrested Monday morning.
A 25-year-old man was arrested several hours later and all three can be held for a total of 72 hours excluding rest periods.
