The 38-year-old was gunned down yesterday external his home in the Dun Emer estate in Lusk, north Dublin, around 9.50am.
He was the drivers seat quickly in the face, neck, arm, abdomen and chest during the incident.
A woman with two youthful children was the first to come across the horrific scene.
It is understood that notwithstanding his serious injuries the victim was conscious when emergency services attained.
He was rushed to Beaumont Hospital in Dublin where his condition is described as serious.
A VW Golf was seen leaving the area and was discovered burnt out at Kilhedge Lane, Lusk a concise time later.
Sources said a handgun and silencer were develop in the vehicle.
Gardai are investigating whether he was shot because of alleged joins to a republican bomber who is the chief suspect in the killing of Gareth Hutch, who was murdered secondary his home in May.
However, Maguire was not thought to be involved in the Hutch – Kinahan disagreement.
A second theory is that he was shot by the INLA over fears that he agreed to gardai about a suspected extortion racket.
The victim is an associate of Declan ‘Whacker’ Duffy and is due to survive c jilt trial for a tiger kidnapping.