He had been in hospital since the incident in Blanchardstown.
Gardaí have launched a second murder investigation following the death of the man who was shot in a restaurant in Dublin on Christmas Eve.
48-year-old Jason Hennessy was pronounced dead at the Mater Hospital today.
His alleged attacker, Tristan Sherry, was stabbed to death during the incident, and three people have been arrested in connection with his death.

Kildare-Based Animal Rescue Group Continue Calls To Ban Sulky Racing On Public Roads
National Homeless Figures Increased By Almost 200 In February
Trial Date Set For Man Accused Of Attempted Murder Of Three Children In Dublin attack
Piper’s Hill College Among Schools Awarded National LGBTQ+ Quality Mark
North Kildare Road Closures Planned As Major Water Works Get Underway
Planning Approved for €260m Expansion of Newbridge Brewery
€100,000 Spent Repairing Historic Kildare Canal Bridge After Repeated Crashes
Boost for Special Education in Kildare—But Gaps Remain