Denis Martin Donaldson (1950 – 4 April 2006) was a volunteer in the Provisional Irish Republican Army (IRA) and a member of Sinn Féin who was killed following his exposure in December 2005 as an informer in the employ of MI5 and the Special Branch of the Police Service of Northern Ireland (formerly the Royal Ulster Constabulary). It was initially believed that the Provisional IRA were responsible for his killing although the Real IRA claimed responsibility for his murder almost three years later. His friendship with French writer and journalist Sorj Chalandon inspired two novels: My Traitor (published 2007) and Return to Killybegs (published 2011). Paramilitary and political career Donaldson had a long history of involvement in Irish republicanism. He joined the Irish Republican Army in the mid-1960s while still in his teens, well before the start of the Troubles. According to a former friend, Sinn Féin activist Jim Gibney, writing in the Irish News, he was a local hero in Short Strand in 1970 because he took part in the gun battle between Ulster loyalists and Irish nationalists at St. Matthew's Chapel. Donaldson was a friend of IRA hunger striker Bobby Sands, and the two men served time together in Long Kesh for paramilitary offences in the 1970s. Donaldson has been accused by an unnamed republican source of being part of the IRA team that carried out the La Mon restaurant bombing in 1978, one of the most notorious bomb attacks of the Troubles. In 1981, he was arrested by French authorities at Orly airport along with fellow IRA volunteer William "Blue" Kelly; the duo were using false passports and Donaldson said that they were returning from a guerrilla training camp in Lebanon. At the 1983 general election, Donaldson was the Sinn Féin candidate in Belfast East, but only polled 682 votes. In the late 1980s, he travelled to Lebanon again and held talks with both Lebanese Shia militias, Hezbollah and Amal, in an effort to secure the freedom of Irish hostage Brian Keenan. As the Sinn Féin leadership under Gerry Adams and Martin McGuinness turned toward a peace process strategy, Donaldson was dispatched to New York City, where he helped establish Friends of Sinn Féin, an organisation that solicited mainstream political and financial support for the new strategy while attempting to isolate hard-line activists in Irish Northern Aid and other support organisations in the United States. Martin Galvin,