The first victim of the Bloody Sunday shootings is due to give evidence to the Saville Inquiry this week.
Damien Donaghy, who was 15 when he was shot, is set to enter the witness box at the Guildhall in Derry, to give a first-hand account of what happened to him in the city on January 30, 1972.
A total of 13 men were killed that day during what was designated a military arrest operation following an anti-internment march in the Catholic Bogside district.
Another injured man, John Johnston, 59 died five months later.
Mr Donaghy will be the first victim of the day to give live evidence to the Bloody Sunday Inquiry, which was established in 1998 to conduct a fresh probe into events. He is likely to take the stand on Wednesday.
He was one of two casualties wounded before paratroopers moved into the area.
They were shot in William Street close to where soldiers were positioned on the perimeter of the Bogside.
The inquiry is chaired by Lord Saville of Newdigate and has been sitting in public in Londonderry since last March.