Martin McGuinness, former member of the Provisional Irish Republican Army‘s (IRA) Army Council and Sinn Féin‘s chief negotiator in the peace process, dies on the morning of March 21, 2017 at Derry‘s Altnagelvin Area Hospital with his family by his bedside. He had been diagnosed with a rare heart disease in December 2016. In 2011, McGuinness contests the presidential election which is won by Michael D. Higgins.

McGuinness is born James Martin Pacelli McGuinness on May 23, 1950 in Derry. He attends St. Eugene’s Primary School and later the Christian Brothers technical college, leaving school at the age of 15.

McGuinness joins the IRA about 1970, and by 1971 he is one of its leading organizers in Derry. In 1973 a Special Criminal Court in the Republic of Ireland sentences him to six months in prison after he is caught in a car containing large quantities of explosives and ammunition. Although the IRA keeps secret the membership of its seven-person Army Council, few doubt that McGuinness is one of its most important members from the 1970s through the 1990s. Even while reportedly planning attacks on civilians in Northern Ireland and on the British mainland, McGuinness is involved in spasmodic secret talks with British government ministers and officials to end the conflict. In 1972 McGuinness, with fellow IRA leader Gerry Adams, privately negotiates with British Secretary of State for Northern Ireland William Whitelaw, but these and other talks over the next two decades are unsuccessful.

McGuinness contests seats in the British House of Commons on several occasions, losing in 1983, 1987, and 1992. However, in 1997 he is elected to the House of Commons to represent the constituency of Mid Ulster and, in line with party policy, he does not take his seat. He subsequently wins reelection to the seat in 2001, 2005, and 2010.

McGuinness is the IRA’s chief negotiator in the deliberations, also secret at first, that culminate in the Good Friday Agreement in 1998. This pact finally ends the conflict and eventually brings Sinn Féin into a coalition government to rule Northern Ireland. He is elected to the new Northern Ireland Assembly and in 1999 is appointed Minister of Education. In this post he eliminates the controversial eleven-plus examination, which determines which type of secondary school a child should attend. The test had been abolished in most of the rest of the United Kingdom more than 25 years earlier.

Disagreements over such issues as policing and the decommissioning of arms causes Northern Ireland’s Executive and Assembly to be suspended for some years, but a fresh agreement in 2006 paves the way for them to be revived. In elections in March 2007, both Sinn Féin and the antirepublican Democratic Unionist Party (DUP) gain seats, becoming the two largest parties in the Northern Ireland Assembly. McGuinness becomes Deputy First Minister, working with First Minister Ian Paisley, leader of the DUP. The two men, previously bitter enemies, perform so well together that they are dubbed the “Chuckle brothers.”

When Paisley retires in 2008, he is succeeded by the DUP’s Peter Robinson, who is considered to be even more militantly antirepublican. Once again, however, a shared need to rebuild the economy and attract international investment leads to cooperation between former opponents. In 2009 their government is in jeopardy as Sinn Féin and the DUP argue over the devolution of the police and justice system in Northern Ireland. McGuinness and Robinson are involved in the ensuing negotiations, and in February 2010 an agreement is reached for the transfer of powers from Britain to Northern Ireland in April.

In the Assembly elections in May 2011, McGuinness and Robinson are a formidable pair, and voters respond to their call for stability in a time of economic uncertainty. Sinn Féin gains an additional seat and increases its overall share of the vote, and McGuinness is assured an additional term as Deputy First Minister. In the autumn he steps down to run as Sinn Féin’s candidate for the presidency of Ireland. After finishing third in the election held on October 28, he returns to the position of Deputy First Minister a few days later. On June 27, 2012, in an event widely seen as having great symbolic importance for the ongoing reconciliation efforts in Northern Ireland, McGuinness and Elizabeth II shake hands twice, once in private and again in public, during a visit by the British monarch to Belfast.

In January 2017 McGuinness resigns as Deputy First Minister in response to First Minister Arlene Foster’s refusal to temporarily step down from her position during the investigation of a scandal relating to the government’s Renewable Heat Incentive (RHI), a mishandled program under which large amounts of state funds allegedly had been squandered. Foster had served as head of the department that oversaw the RHI before becoming First Minister. Under the power-sharing agreement the posts of First Minister and Deputy First Minister constitute a single joint office so that the resignation of one minister results in termination of the other’s tenure. When Sinn Féin chooses not to nominate a replacement for McGuinness within the required seven-day period, authority reverts to the British government’s Secretary of State for Northern Ireland in advance of a snap election on March 2.

Even before McGuinness’s resignation there had been speculation late in 2016 that he might step down for health reasons, and soon after resigning he confirms that he is suffering from amyloidosis, a rare disease brought about by deposits of abnormal protein in organs and tissue. With McGuinness removing himself from “frontline politics,” Michelle O’Neill leads Sinn Féin into the election. The disease claims McGuinness’s life only months later on March 21, 2017.