A second man arrested as part of a Garda investigation into the Real IRA murder of MI5 agent Denis Donaldson almost 12 years ago has been released without charge.
Donaldson, a senior Sinn Fein official and close colleague of Gerry Adams and Martin McGuinness, was shot dead at a remote cottage near Glenties, Co Donegal, in 2006.
The RIRA murder came four months after Donaldson publicly admitted spying on Sinn Fein for British Intelligence.
Two men were arrested on Sunday in Donegal.
One of the suspects, leading Derry dissident and independent councillor Gary ‘Donzo’ Donnelly was released on Monday afternoon.
A Garda spokesman said a second man, aged in his 30’s, was released after being held for about 24 hours.
A file on the investigation related to the second man is to be prepared for the Director of Public Prosecutions.
A spokesman for Gardai said that they are continuing to appeal to anyone with information in relation to this murder to contact them.
The inquest into Donaldson’s murder has been delayed now some 19 times.
Lawyers acting for his family are trying to have his journal released to the Police Ombudsman who is investigating claims of police collusion in his murder.