Adams claims IRA man who investigated Portlaoise prison officer's murder did not say he knew killers

The Sinn Féin leader Gerry Adams has claimed the IRA man who investigated the death of Portlaoise Prison Officer Brian Stack may not know who committed the crime.

Speaking on RTÉ's Morning Ireland also said would not give the man's name to the Gardaí. Deputy Adams also said he did not know who killed the prison officer who was shot in 1983.

Deputy Adams said the IRA man he asked to investigate the crime did not tell himself and Brian Stack's sons that he knew the perpetrators or if they were still alive. 

Austin Stack has said the IRA man they met with the Louth TD in 2013 had spoken with the killers and that they were still alive.

Austin Stack also told Primetime last night the he had already given the IRA's man to the gardaí.