Ian Paisley Jr, son of the Rev Ian Paisley and senior member of the anti-agreement DUP has called on Sir John Stevens to investigate claims that murdered Belfast lawyer Pat Finucane was a member of the IRA.
The call comes only weeks after the confirmation of collusion between elements of British security services and loyalist death squads in the murder of Catholics, including that of Mr Finucane, in the North.
Mr Paisley is basing his call on allegations made by Seán O'Callaghan a former IRA informer who later advised UUP leader Mr David Trimble on the intentions of the IRA.
It was claimed by O'Callaghan that Mr Finucane smuggled information between prisoners and IRA leaders.
Mr Paisley said: "These startling claims have not to date been examined by Stevens' investigation.
"I have written to him asking him to consider them as a matter of urgency as they seriously damage the basis of the inquiry that Finucane was some halo-covered human rights lawyer when it appears there is evidence to suggest otherwise."
RUC and British Army collusion with the loyalist gunmen who assassinated Mr Finucane in February 1989 was uncovered following an investigation headed by Sir John Stevens.
He insisted there was absolutely no evidence linking the solicitor to the paramilitary organisation.
Policing Board members are expected to question Mr Orde on the devastating findings of the Stevens Inquiry - which he ran before coming to Northern Ireland - when he briefs them in Belfast tomorrow.
The report published last month confirmed that members of the Royal Ulster Constabulary's Special Branch and military intelligence's shadowy Force Research Unit helped Ulster Defence Association gunmen plan the murder of Mr Finucane.
Up to 20 serving and retired members of the security forces may face criminal charges once the Director of Public Prosecutions studies files sent by Sir John.
Members of the Finucane family declined to comment tonight on either Mr O'Callaghan's allegations or Mr Paisley's plans. But the DUP man claimed demands for a public inquiry into Pat Finucane's killing, similar to the Saville Tribunal into the 1972 Bloody Sunday shootings, would be a waste of millions of pounds.
In his letter to Sir John, he asked him: "Have you interviewed Sean O'Callaghan? Given the content of his article, do you intend to interview him?
"If, as he says, Finucane was not only an IRA member, but an activist who used his privileged position as a solicitor to act as a conduit between IRA prisoners and the IRA on the outside, then surely this is a very serious development that you have to date failed to discover? "I would like you to confirm that you will now investigate these claims by Sean O'Callaghan."
He added: "The Finucane murder inquiry has taken on a life of its own that propels a notion that only his murder is worthy of special treatment and only his killers will be pursued.
"If, as it is now claimed, Finucane was himself an IRA man, maybe your inquiry has been at the expense of seeking justice for genuinely innocent victims of the troubles."
PA