Gardaí yesterday were still holding a man, arrested at the weekend as part of the investigation into the murder of former Sinn Féin member Denis Donaldson near Doochary five years ago.
A man in his 40s, understood to be a prominent republican dissident from Derry, was arrested on Saturday evening in Monaghan.
He was still detained at Monaghan Garda Station under Section 30 of the Offences against the State Act yesterday.
The man is the third person to be arrested about the murder which no one has ever been charged with. Two men were arrested in Donegal last April but were later released without charge.
Mr. Donaldson (56) was murdered at his home at Cloghercor, Doochary in April 2006. He had been staying at the remote cottage after admitting to being a British agent for 20 years months earlier. Before his admission of his role as a British agent he had been a prominent member of Sinn Féin.
In 2002 he was implicated as part of an investigation into an alleged ‘spy ring’ in Stormont, where he worked for Sinn Féin, but charges were later dropped.
His presence in County Donegal first came to the attention of gardaí in January 2006 and he was last seen alive in Glenties on April 3rd, about 24 hours before he was murdered. The body of the Belfast native was discovered by a member of the public. He died from injuries caused by two shot-gun blasts.