A young man died in his blood-spattered home after he was attacked and stabbed a number of times on his own doorstep.
Medics frantically fought to save Noel Whelan (22) after he was brutally attacked at around 6pm on Saturday - but he was later pronounced dead at the scene. Last night, gardai were questioning a man in his 40s, who was known to the victim.
A neighbour at Castlecurragh Heath, Mulhuddart, said she heard cries of "Stop, stop" coming from the house on Saturday evening.
It is believed Mr Whelan, originally from Coolock, was stabbed repeatedly in the horror attack. Blood could be seen on the floor and walls of the hallway as forensic detectives examined the scene.
A short time later, a man in his 40s, who knew Mr Whelan, presented himself to a Dublin garda station in connection with the crime.
He was arrested and is being held at Finglas Garda Station.
The incident is not believed to be linked to feuds in the Mulhuddart/Blanchardstown area.
Gardai continued to make door-to-door enquiries yesterday afternoon and kept the house sealed off.
It is understood Mr Whelan, known as 'Noelie', had lived in the property for around a year.
One neighbour described him as a "proper gent" who was very popular among his peers.
"I didn't know him that well but he was always very nice to me whenever I passed him by. I often saw him drive up the road - he seemed like a real character," the shocked neighbour said.
"I'm just so shocked by what happened and can't get my head around it. I feel so sorry for his family, especially his mum who is spending Mother's Day grieving for her son."
Mr Whelan's body was removed from the scene and a post-mortem has been carried out. Members of his family in Coolock were too grief-stricken to talk yesterday and have appealed for privacy while they come to terms with their loss.
Dublin West TD Jack Chambers said gardai needed to do more to ensure the safety of locals.
"It's shocking to see such a violent attack in a residential area and my thoughts are with the victim and his family at what must be such a difficult time," he said.
"Communities in Dublin west are experiencing a worrying escalation in violence and crime in recent times.
"We need law and order. We need to ensure that people going on with their daily lives are given the presence and support of An Garda Siochana."
Neighbours also called for a larger garda presence in the area.
"We're constantly being burdened with criminal activity here," said one resident.
"Drug deals, fights and burglaries take place in Mulhuddart very regularly but gardai are doing very little about it. Many of us have CCTV cameras outside our homes for our own protection. I'm constantly being woken up by blaring music from parties that go on through the night.
"I only hope this incident will make gardai aware of what's really happening around here," he added.
Another local man said he now feared for his young daughter's safety.
"I'm actually frightened to let her play outside. There is so much violence and drugs around here that I'm afraid she will be pricked by a needle.
"I would move out of this place in a second if I could."
Meanwhile, friends and loved ones of Mr Whelan took to social media to pay tribute.
"You really don't know what tomorrow holds for any of us," said one friend.
"Always let the ones you love know it and give them an extra squeeze tonight.
"A devastating time for the area, losing another genuine, nice bloke.
"RIP, Noelie, you'll be sadly missed. So hard to believe."
Another mourner wrote: "Absolutely heartbreaking, can't believe it. RIP, pal, such a nice person.
"Thinking of all the family at this horrible time."
Mulhuddart councillor Tania Doyle said it was important Taoiseach Leo Varadkar was aware the incident had happened in his constituency.
"Gardai are working extremely hard with the very limited resources they have but they can't do their jobs properly if there's not enough of them," she said. "The Taoiseach needs to be made aware that his constituency in Dublin 15 is in desperate need for a much larger garda presence."
The tragedy comes just weeks after a father-of-two was shot three times while in traffic at the junction of Blakestown Road.
The victim, Lee Boylan, from Fortlawn Avenue, remains in a critical condition in Beaumont Hospital.
Three days before Christmas, 34-year-old Eric Fowler was shot dead in Blakestown in what gardai said was a targeted gang-related attack.
They say there has been an escalation in gun and related crime in the area, with feuds ongoing in Corduff and in the greater Finglas/Blanchardstown areas.
Anyone with information about Saturday's tragedy is urged to contact Blanchardstown Garda Station on 01-6669000 or the Garda Confidential Line (1800 666 111).