According to former BBC security correspondent Brian Rowan, Scappaticci was involved in the killing of informer Joseph Fenton:
- So far, all so tragically predictable. But, says Rowan, the man who interrogated Fenton on behalf of the IRA was Freddie Scappaticci, the head of the IRA's internal security unit or 'nutting squad', who himself was later alleged to have been a long-time, high-level double-agent, codename 'Stakeknife', working for the RUC Special Branch and the Army's Force Research Unit. Rowan suggests that the fact that one agent working for the State was responsible for passing a death sentence on another agent (and many, many others besides) gives a glimpse of just how dirty the 'dirty war' really was.
Journalist Martin Dillon has written of the 'Stakeknife' claims:
- It could be argued that the 'Stakeknife' story was created to minimise the damaging effects of the Stevens investigations on the whole intelligence community. It shifted the media focus to the IRA - a partner in the peace process, with an equally violent role in the dirty war. One could reasonably assume 'Stakeknife' was intended to weaken the IRA at a time when it was refusing to decomission its arsenal. The unsubstantiated 'Stakeknife' revelations created deep suspicion in IRA ranks. some of its leading operatives considered breaking with the organisation and transferring their loyalties to an IRA offshoot.
- Rosie Cowan, He did the IRA's dirty work for 25 years - and was paid £80,000 a year by the government, The Guardian, 12 May 2003.
- Woman can sue 'Stakeknife' accused Freddie Scappaticci, BBC News, 8 April 2011.
- Tim O'Brien, RUC officer refuses to tell tribunal whether Scappaticci is 'Stakeknife', Irish Times, 8 February 2012.
- Liam Clarke, Freddie Scappaticci was our most valuable spy in IRA during the Troubles: British Army chief, Belfast Telegraph, 20 April 2012.
- Stakeknife, British Irish Rights Watch, accessed 2 April 2009.
- Patrick Corrigan, Brian Rowan and the curious case of the 'dirty war', Belfast and Beyond blog, Amnesty International, 1 April 2009.
- Martin Dillon, The Trigger Men, Mainstream Publishing, 2004, p.276.