Denis Donaldson

Former Sinn Fein official and informer for the British security forces, who was murdered in April 2006.

Exposure

Three men, one of them Mr Donaldson, were arrested at the time - but late in 2005 prosecutors said they were dropping all charges "in the public interest".

That public interest became clear when days later Mr Donaldson confessed publicly to being a double agent, an admission that led to his immediate expulsion from Sinn Fein and republican circles.

In his statement in December 2005, Mr Donaldson confirmed that he had been a British agent at the time of the raid and he apologised to his "former comrades" and family.

"I was recruited in the 1980s after compromising myself during a vulnerable time in my life," he said. "Since then, I have worked for British intelligence and the [Police] Special Branch.

"Over that period I was paid money. My last two contacts with Special Branch were as follows: two days before my arrest in October 2002, and last night, when a member of Special Branch contacted me to arrange a meeting.

"I was not involved in any republican spy ring at Stormont - I deeply regret my activities with British intelligence and Special Branch."

At the time, Gerry Adams claimed that Mr Donaldson had spoken out because he was about to be "outed" by police officers determined to deflect attention from the raid.

Dean Godson

Dean Godson suggested that in the wake of Donaldson's murder, Ian Paisley would delay any deal with Sinn Fein:

This latest atrocity has confirmed "the Doc in his belief that republicans remain irredeemably attracted to the call of the wild and that Sinn Fein is still no normal political party. The ability of the DUP's "modernisers - so admired by the Northern Ireland Secretary, Peter Hain - to "deliver their side of the bargain has dramatically diminished. Any deal is likely to be long fingered into the post-Blair era. And the future is a foreign country, where anything can happen.

The full story of Denis Donaldson, one of Britain's main agents inside Sinn Fein/IRA, will probably never be known. He certainly played the part of a dyed-in-the-wool Belfast sectarian with consummate skill. When I met him at Stormont, some years ago, the first thing he told me was: "My grandmother used to say: 'Burn everything British except their coal'.

Connections

• Dean Godson