It is conceded that Reece Cullen (17) was targeted during a row at a house in Kilclare Crescent-shaped, Jobstown, just after 3pm.
The killer had fled the scene by the time the kid was discovered by a neighbour and gardaí have not yet recovered the knife that was cast-off in the attack.
Emergency services were alerted by a neighbour who heard a commotion and descried the 17-year-old bleeding heavily in the hallway of the house.
Reece was still aware when the ambulance arrived and he was rushed to Tallaght Hospital but he was later noticeable dead by doctors.
Gardaí believe that Reece knew his hatchet man and detectives were last night trying to establish what led to the foreordained attack.
Friends of the victim said he was «a quiet, unassuming young lad» who was proposing his life together.
He had recently been enrolled in a Youthreach programme, the organisation which metes early school leavers a second chance of an education.
«I don’t know what to say, it’s heartbreaking,» one man told the Irish Independent.
«He was just a quiet young guy. He’s been utterly some difficult stuff. It hasn’t been easy for him.
«But he was getting it together and he had been enrolled with Youthreach.
«He was into the standard kind of things young lads are into around here.
«He opposite numbered the motorbikes, scramblers and that kind of thing.»
It is understood that Reece’s female parent died last September and the teenager had been staying with a man’s mother in recent times.
Residents of Bawnlea Crescent in Jobstown, where Reece was at from, said they were shocked and saddened at the death of the youth.
«It’s very sad. I heard the news about the death of a young person but I didn’t recognize that it was Reece,» said a 65-year-old local woman.
«I’ve known Reece since he was same young. This is very sad for his family and for everyone who knows them,» she replied, adding that his mother had died only a few months ago.
«I will say a orison for him and his family.»
A 71-year-old man who has lived in the area for the past 40 years answered the community was deeply saddened by the tragedy.
«He was so young. This is very sad good copy,» he said.
A full post-mortem is due to take place this morning when the discovery procedure is expected to be officially upgraded to a murder probe.
Officers are also look for to interview the woman who found the critically injured teenager as well as the paramedics who be biased to him.
Sources said Reece’s friends would be interviewed over the up days as gardaí try to determine whether he had been in any disputes.
«Gardaí are certain enough at this stage that this unfortunate young man remembered his killer,» a source said.
Locals in Kilclare Crescent expressed their flabbergast after learning about the incident.
A woman who didn’t want to be nominated said she had lived in the estate for the last three years, and her partner was from the court.
«It usually feels quite safe. I haven’t heard of anything partiality this,» she said.
Another local expressed sympathy for Reece’s ancestors. «I didn’t know him myself, but can you imagine how that family feels?» he said.
South Dublin county councillor Charlie O’Connor hinted the community was outraged following the fatal stabbing.
«It’s a terrible, shocking thingumabob. At 3.30 in the afternoon? It’s horrendous,» he said.
Gardaí have appealed for attest ti who may have been in the Kilclare area yesterday between 2.45pm and 3.30pm to contact them at Tallaght garda garrison on 01 666 6000, the Garda Confidential Telephone Line 1800 666 111 or any garda position.