Gardaí investigating the murder of a man who was stabbed in the head with a screwdriver at the weekend have arrested a man in his late teens.
Gardai in Crumlin began questioning the man under Section 4 of the Criminal Justice Act after his arrest at 4pm, a spokesman said.
Earlier, detectives released a 15-year-old boy without charge. He was released from Crumlin Garda station early this morning and a file will be sent to the DPP.
Another teenager (19) who was arrested at an address in Inchicore, Dublin on Monday was released last night.
Marius Szwajkos from Szczucin in Poland, was attacked outside a row of shops on Benbulbin Road, Drimnagh. The 27-year-old was with a Polish friend when they became involved in what the Garda described as a minor verbal altercation with a number of local teenagers.
His friend is fighting for his life after he was stabbed in the throat during the attack just before 7pm on Saturday.
During the altercation one of the group left the scene and returned a short time later armed with a screwdriver. He stabbed Mr Szwajkos in the back of the head before stabbing the other man in the neck.
Both of the injured men were taken by ambulance to St James's Hospital. Mr Szwajkos died from his injuries on Monday. His injured friend remains in hospital in a critical condition.
The injured man has been unconscious since the incident. Tests are due to be carried out today to determine his levels of brain activity.
Gardaí believe the victims were set upon by a group of three local teenagers. The two victims were living in a rented house close to the murder scene. They were staying at the house with another Polish man and two women.
The victims have been living in Ireland since last summer and had been working in the construction sector. They were described by locals as quiet and hard-working.