A YOUNG man who handed himself in to gardai investigating a fatal stabbing in Swords on Thursday night was still being held today.
James Joyce (20) died after the knife attack on a green area at St Cronan's Avenue around 9.30pm.
Twelve hours later, a man walked into Lusk Garda Station and volunteered to assist with the investigation.
He was arrested and taken to Swords Garda Station where he was still being quizzed today.
A decision to charge or release him is expected to be made shortly.
The victim was killed in front of his pregnant girlfriend, Alison Colgan, who is due to give birth in October.
A friend of the dead man, Donna Bell (19) said today that James "died a hero".
"He was one of my mates for years. I'm just devastated," she said. "I hope his family find some comfort in that and that's what he'll be remembered for. "
Ms Bell told the Herald that James "jumped in for one of his friends and he was a true friend without a doubt".
"You hear screams all the time around here but then my father came in and told me what happened and then we got the news that it was James.
"Whoever did this to him is a coward to kill James. No human being deserves to die like James did," he said.
Locals have praised James as a hero, saying that he was stabbed after intervening to stop a row between two other men who had been engaged in a long-term dispute over a girl. One ran off to a nearby house returning with two knives.
He slashed out a number of times and is understood to have struck "Good Samaritan" James, severing an artery.
James' devastated girlfriend Alison told the Herald that his attacker had hidden two knives in his sleeve and "just started stabbing James".
The victim's father Patrick arrived on the scene shortly afterwards and watched on in horror as his son lay dying.
Anyone with information has been asked to contact Swords station at 01 6664700 or the confidential line, 1800 666111.