Published Tuesday, 13 May 2014
Kieran Doherty, who was a member of the Real IRA, was gunned down by his former associates in Londonderry in February 2010.
At the time of his murder, the Real IRA claimed he was involved in criminality and drugs.
However, his family insist he had turned his back on his past when was killed.
Before his death relatives claimed he was being harassed by MI5 and that the security services were trying to recruit him as an informer.
However an independent report found that MI5 had no involvement in the killing - findings rejected by the Doherty family.
During a preliminary inquest hearing on Monday, a police inspector confirmed that one of the main suspects in the murder has since been shot dead himself.
It's understood Peter Butterly, who was killed near Drogheda last year, was that suspect and had been a business associate of Kieran.
The family said the murder of Mr Butterly was "another needless death" and reiterated its calls for MI5 to disclose what it knows in regards to Kieran's death.
© UTV News