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Peter Morrison, Associated Press
Police and ambulance crews at the scene of a fatal shooting in the Markets area of South Belfast, Northern Ireland, Tuesday, May 5, 2015, where former senior IRA man Gerard ``Jock’’ Davison was gunned down early Tuesday outside his home. Davison was a Belfast IRA commander when he allegedly ordered IRA comrades in 2005 to kill Robert McCartney, in a killing which prompted relatives to seek justice and is widely seen as an act which eventually helped spur the IRA to renounce violence.

DUBLIN — A former Irish Republican Army commander linked to one of the outlawed group's most notorious killings has been shot to death in Belfast, residents and police said Tuesday.

No group claimed responsibility for shooting Gerard "Jock" Davison at short range near his home in the Markets neighborhood of south-central Belfast. He was in his mid-40s.

Davison was a Belfast IRA commander in 2005 when he allegedly ordered IRA comrades to attack a man, Robert McCartney, at a pub near the Markets following an exchange of insults. McCartney's widow, mother and four sisters took their demands for justice all the way to the White House, winning support from Hillary Clinton and the late Sen. Edward Kennedy, and their campaign helped spur the IRA to renounce violence and disarm later that year.

Davison was arrested on suspicion of ordering the killing but not charged. Two others, including his uncle Terence Davison, were charged with McCartney's murder but acquitted in 2008. Nobody was ever successfully prosecuted for the attack, which happened in front of dozens of witnesses, amid claims of IRA intimidation.

McCartney's sisters accused Gerard Davison of making a throat-slashing gesture to his IRA colleagues in the crowded pub shortly before McCartney, 33, was fatally stabbed outside the pub. IRA members confiscated the pub's surveillance video footage, cleaned up the forensic evidence and ordered pub-goers to tell police nothing or risk IRA retaliation, according to police and court testimony.

IRA representatives met McCartney's widow and sisters and offered to have the IRA members responsible killed as punishment, an offer they rejected. The IRA and its allied Sinn Fein party later announced they had expelled or suspended three IRA members and eight Sinn Fein members over their alleged role in the assault on McCartney and the evidence cover-up.

Gerard Davison always denied involvement in the McCartney attack, insisting he tried to act as a peacemaker when McCartney and McCartney's friend Brendan Devine got into an argument inside the pub with Davison's uncle and IRA members at his table.

Davison's body lay in the street Tuesday until police constructed a tent around the victim to protect forensic evidence. Residents said at least a few of Davison's three children saw their father lying dead and ran screaming to their nearby home.

Senior members of the IRA and Sinn Fein arrived at the police cordon to talk with agitated residents of the Markets, an Irish Catholic district near Belfast City Hall that was often a venue for shootings and bombings during the bloodiest years of Northern Ireland's four-decade conflict. The Markets also featured bloody turf wars in the past between the dominant IRA faction, the Provisionals, and the smaller Official IRA over control of pubs and other criminal rackets.

Sinn Fein official Alex Maskey said his party wouldn't speculate on who killed Davison or why. He called Davison "a longstanding republican" who was "very well regarded."

A social club for Provisional IRA members who have served prison time, the Felons Club in Catholic west Belfast, in a statement called Davison "a great man" who was killed by "cowardly criminal lowlifes."

When Davison wasn't charged in connection with the attack, one of McCartney's sisters accused him of being a paid police informant who was being protected in exchange for intelligence on IRA activities — a charge he rejected in a 2007 interview.

The Provisional IRA is observing a 1997 cease-fire in support of Northern Ireland's peace process after killing nearly 1,800 people in a failed effort to force the British territory out of the United Kingdom and into the Republic of Ireland. But splinter groups continue to mount bombings and shootings, and feuds within the IRA's fractured ranks can turn deadly.

Northern Ireland's last fatal shooting came in April 2014, when a former Belfast commander of a faction called the Continuity IRA was killed by former comrades.