The Saville Inquiry into Bloody Sunday will hear evidence from its last witness in Derry's Guildhall today.
The inquiry is investigating the killing of 13 unarmed civil rights demonstrators by the British army in the city on January 30th, 1972. A 14th person died later.
The final witness today will be a former member of the Provisional IRA.
The tribunal has been sitting for four years, has heard evidence from 919 witnesses and will end up costing an more than €200 million.
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Lord Saville and his two fellow judges, William Hoyt and John Toohey, are expected to deliver the findings in the first half of 2005.