Trevor Lunn MLA said: “I have the utmost respect for our security services and am proud of the honourable actions of the vast majority of those who served during the dark days of the Troubles, but there must be a proper investigation of any incidents of State collusion with paramilitaries in murder.
“The Government has already apologised and said that state collusion should never have happened, but it is important that any allegation is seriously investigated.
“If we are to uphold the rule of law, then any involvement by the Police, Army or Intelligence services in the murder of any individual must not be ignored and those responsible held to account.
“The five main parties had reached a deal in the Stormont House Agreement with the two governments around mechanisms to deal with the past, but the decision of the SDLP, Sinn Fein and Green Party to block the welfare legislation has raised doubts on its implementation. The actions of these parties have let down victims.”