They have been named locally as Anthony Hogg and his wife Georgina Hogg Moore.
A suspect in the incident was arrested after he presented at Blanchardstown Garda station later in the evening.
The man, aged in his 40s, is currently detained under Section 4 of the Criminal Justice Act, 1984, at a Garda station in Dublin.
The deceased decouple, who have two children, are from the Blanchardstown area.
It’s understood Georgina is 39-years-old while her husband is 40.
Paying tribute online, a family member begged for anyone with information to come forward.
“Thanks for all the texts and calls as you can all image as a family we are absolutely broken hearted, but if anyone knows anything please come forward I beg you,” the relative said.
Georgina was pronounced dead at the scene, while her husband was rushed to hospital but later died from his injuries.
They were struck by a vehicle that fled the scene of the incident on Blanchardstown Road South at about 5.45pm.
Gardaí and emergency services attended the incident and a technical examination of the scene has been completed by Garda Forensic Collision Investigators and the road has now reopened.
Local Sinn Fein TD Paul Donnelly said: “Deepest condolences to the family, friends and neighbours of the two people who died following a horrific hit and run today along the Blanchardstown Road south.
“We simply cannot imagine the pain, hurt and anger of the family and community.
“The person who drove away leaving one person dead and another fighting for his life, sadly to lose it later, must face the full forces of the law and justice.
“One person has been arrested and is being questioned.
“If anyone has seen anything at the time of the incident or has any information, please let the Gardaí know as soon as possible.”
Gardaí continue to appeal to anyone who may have witnessed this collision to hecontact them.
Any road users or pedestrians who were in the vicinity of Blanchardstown Road South, between 5pm and 6pm on Thursday, 26th December 2024, and have camera footage (including dash-cam) are asked to make this available to investigating Gardaí.
Anyone with information is asked to contact Blanchardstown Garda Station at 01 666 7000, the Garda Confidential Line on 1800 666 111, or any Garda Station.