He had stepped down as Northern Ireland's Deputy First Minister in January and had been unwell for several months.
He was a former member of the IRA's army council and worked as Sinn Fein's chief negotiator during the peace process.
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Paying tribute this morning, Sinn Fein President Gerry Adams desribed martin mcguinness as a passionate republican who worked tirelessly for peace and reconciliation and for the re-unification of his country.
But he said above all he loved his family and the people of Derry and he was immensely proud of both.
The former IRA chief made one of his last public appearances in January when he resigned over the DUP leader's handling of a botched green energy scheme.
