Judge Barron retired in 2000. He was then commissioned to investigate the 1974 Dublin and Monaghan bombings and Judge Liam Hamilton replaced him in the Supreme Court. He retired from the bench due to ill health. He investigated bombing incidents in Castleblayney, Dundalk, Dublin Airport, the Miami Showband murders and the deaths of eighteen other individuals. His report, termed The Barron Report and presented to the Oireachtas Joint Committee on Justice in December 2003, was highly critical of the investigation into the bombings by both the Fine Gael-Labour government and the Gardaí, and stated they might have made a better attempt to catch those responsible. He did not lay any definitive blame on the British Government.