A retired garda has begun a legal challenge against findings by the Smithwick Tribunal that he gave information to the IRA about a man it subsequently murdered.

The High Court heard today that Owen Corrigan totally rejected findings made by former District Court President Peter Smithwick.

Judge Smithwick found that the retired detective told a senior IRA operative the late Tom Oliver was a garda informant shortly before Mr Oliver was abducted and murdered.

Mr Corrigan wants the court to quash and remove certain findings about him contained in the judge's report concerning the killing of senior RUC officers Chief Superintendent Harry Breen and Superintendent Robert Buchanan by the IRA in March 1989.

The Smithwick Tribunal was set up to investigate claims that a member of An Garda Síochána colluded with the Provisional IRA in the murders.

Last December, the tribunal found that unnamed members of the gardaí had colluded with the IRA in respect of the RUC men's deaths.

The tribunal made no finding that Mr Corrigan, who retired in 1992, was involved in this collusion. 

The application to bring the challenge was made before Mr Justice Michael Moriarty.

The judge said he would consider the matter and give his ruling whether to grant leave tomorrow.