On 25 March 1983, the Chief Prison Officer at Portlaoise prison Brian Stack left a boxing match at the National Stadium in Dublin. His job involved him supervising the fortress that held the IRA's most dangerous prisoners. As he left boxing that night a gunman shot him in the neck. Stack survived but was paralysed, and lingered for 18 months before dying in September 1984, aged 49. He left behind his widow Sheila and three sons. Three separate Garda investigations produced no charge and no conviction. In 2013, thirty years on, the Provisional IRA finally admitted responsibility. It met with Stacks sons and said the killing was unauthorised, a product of a brutal prison regime. Still no name was offered. His son Austin refused to let it rest. He followed his father into the prison service and spent decades pressing for answers. He sat face to face with Gerry Adams and on another occasion was driven in a blacked-out van to meet the IRA. Last year he published his account, Justice for My Father. The cracks in the official story kept widening. In 2019, Garda Commissioner Drew Harris apologised for failings in the case. An internal review had found 194 errors and omissions in the first investigation alone. Key evidence went missing and has never been explained. Last year, with a file sitting with the DPP, gardaí told the family they were following fresh lines of inquiry. Today Taoiseach Micheál Martin is due to stand in the Dáil and apologise on behalf of the State for the failings in all three investigations.