Irish police say they've arrested a suspect over the murder of a former aide to ex-Irish Republican Army commander Gerry Adams who turned British double agent.
The 56-year-old Denis Donaldson, one of Adams' closest aides, was shot dead in April 2006, months after he acknowledged he had informed on the IRA to Britain's MI5 spy agency for almost two decades.
Police in Dublin said on Tuesday that a 70-year-old man was being held at a police station in northwest county of Donegal, the region where Donaldson was executed in a remote cottage.
Donaldson joined the IRA in 1970 and served as the movement's ambassador overseas from the 1980s to mid-1990s. He became Sinn Fein's chief of administration in Northern Ireland's newly formed legislature in 1999.