of Frangex in the Dominion Theatre in London, to try to kill Prince Charles and Princess Diana who were due to attend a charity pop music concert there. A warning was phoned into the Garda, and the Royal couple were hurriedly ushered from the theatre by their police bodyguard during the concert. The theatre had been searched before the concert and a second search following the warning revealed no device. In 1985, O'Callaghan was elected as a Sinn Féin councillor for Tralee Urban District Council, and unsuccessfully contested a seat on Kerry County Council. Imprisonment After becoming disillusioned with his work with the Irish Government after the murder of another of its agents within the IRA (Sean Corcoran in County Kerry in 1985), which it had failed to prevent despite O'Callaghan's warnings of the threat to him, and sensing a growing threat to himself from the organisation which had become suspicious of his own behaviour, O'Callaghan withdrew from the IRA and left Ireland to live in England, taking his wife and children with him. His marriage ended in a divorce in 1987, and on 29 November 1988 he walked into a police station in Tunbridge Wells, Kent, England, where, presenting himself to the officer on duty at the desk he confessed to the murder of UDR Greenfinch (female member) Eva Martin and the murder of D.I. Peter Flanagan during the mid-1970s, and voluntarily surrendered to British prosecution. Although the Royal Ulster Constabulary offered him witness protection as part of the informer policy, O'Callaghan refused it, and was prosecuted under charges of two murders and 40 other crimes, to all of which he pled guilty, committed in British jurisdiction with the IRA. Having been found guilty he was jailed for a total of 539 years. O'Callaghan served his sentence in prisons in Northern Ireland and England. While in jail, he published his story in The Sunday Times. He was released after being granted the Royal Prerogative of Mercy by Queen Elizabeth II in 1996. Post-IRA life In 1998 O'Callaghan published an autobiographical account of his experiences in Irish Republican paramilitarism, entitled The Informer: The True Life Story of One Man's War on Terrorism (1998). In the book's text he stated (shortly before the death of Eamon Collins, another former IRA member who had prominently turned upon the organisation): I know that the organisation led by Gerry Adams and Martin McGuinness would