Detectives are investigating the killing of a window cleaner as he cycled to work during the morning rush hour.
A lone gunman opened fire on John O'Regan, 48, at Gateway Avenue, in Ballymun, north Dublin, at around 8.45am before fleeing the scene.
It is believed the victim is a father of one who had moved to nearby Barnewall Gardens from Finglas, also on Dublin's northside, in recent years.
Investigating gardai said he was shot a number of times during the morning attack in the residential area off the main Ballymun Road and close to the local garda station.
Paramedics tried to resuscitate the victim at the scene but he he was taken to the Mater Hospital where he was pronounced dead.
Investigators have appealed for witnesses.
There have been conflicting reports about whether the gunman, who may have fired up to six shots, made his getaway on foot, by bicycle or in an SUV.
The shooting happened close to two schools and the cul-de-sac would normally have been busy with children and parents at the time but the schools were closed for the Easter holidays.
Mr O'Regan, who had also worked as a security guard, was not known to gardai for any involvement in organised or serious crime .
Local Fine Gael representative Noel Rock said the victim might have been targeted as he had recently witnessed two murders in the capital.
"H e was a decent fellow who had been living there for a few years with his wife and a young enough child," he said.
"Unfortunately, he had witnessed two murders in the past and seems to have been the victim of a targeted killing. He found himself in the wrong place at the wrong time. It is dreadfully sad."
It is believed there were between five and 10 witnesses to this morning's killing.
But Mr Rock said there was a difficulty in getting people to come forward.
"This is a dark day for Ballymun," he said.
"People in the area are shocked and quite intimidated. This happened within 50 metres of Ballymun Garda station.
"So whoever carried this out has no fear of the police and no respect for law and order."