Former agent, Denis Donaldson, was shot dead in a cottage in County Donegal.
Stephen Sackur talks to a former British army agent in the IRA. "Kevin Fulton" is currently living in hiding.
In the long-running conflict between the IRA and British forces in Northern Ireland the British had one potent weapon - agents.
Spies were planted inside the paramilitary organisation, sometimes close to the very top.
One such agent Denis Donaldson was murdered in Donegal last week.
Another, who goes by the name of "Kevin Fulton" is currently living in hiding.
Stephen Sackur asks him what really happened in Northern Ireland's dirty war and should those involved now be held to account?
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