Sinn Fein Sinn Fein

Martin McGuinness, seen here arriving at 10 Downing Street in central London last October for meetings in his role as Northern Ireland's deputy first minister, has died at age 66. Daniel Leal-Olivas/AFP/Getty Images hide caption

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Daniel Leal-Olivas/AFP/Getty Images

Ian Paisley, then-leader of the Democratic Unionist Party, talks to supporters at the Northern Ireland Assembly Election count in Balleymoney, Northern Ireland, in 2003. The DUP announced Friday that Paisley had died after a protracted illness. He was 88. Peter MacDiarmid/Reuters/Landov hide caption

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Peter MacDiarmid/Reuters/Landov

Sinn Fein President Gerry Adams was arrested Wednesday as part of an investigation into one of Northern Ireland's most controversial killings. Neil Hall/Reuters /Landov hide caption

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Neil Hall/Reuters /Landov