File photo dated 09/12/2005 of Denis Donaldson,as Sinn Fein president Gerry Adams denied sanctioning the murder of the British spy in the IRA.  Wednesday Sept, 21, 2016. The allegation about the 2006 killing of Denis Donaldson was made by a man who claimed he was also a paid state agent in the IRA. (Paul Faith/PA via AP)
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