The chairman of the Saville Inquiry today angrily ordered a witness to leave after he refused to co-operate with lawyers.
Lord Saville of Newgate told Mr Charles Canning he could go after he failed to take the oath or to answer questions about the January 1972 killings of 13 civilians at a civil rights march in Derry.
After he ignored a plea from a lawyer representing most of the relatives of victims, Lord Saville immediately adjourned proceedings.
"I do not think Mr Canning is going to be able to help anybody in this room. You can go away Mr Canning," he said.
Mr Arthur Harvey QC, who was invited by Lord Saville to address Mr Canning, said "his attitude was a gross disappointment".
"The attitude is of no assistance to us in the search for truth and unfortunately if the witness is to persist then he seeks to negate in his own small personal way the search for the truth."
Mr Canning replied that he was entitled to protect himself.
"I am very sorry about the families, the people that died. I did not kill them. I do not see why he (Mr Harvey) is picking on me."
In his statement to the Inquiry made in August 1999, Mr Canning said he had left the British army after spending seven years in the pay corps and had decided to attend the anti-internment march.
He claimed that during the march he saw members of the Parachute Regiment firing indiscriminately from slots in the sides of army vehicles.
Earlier, another witness admitted lying to the authors of a book about Mr Martin McGuinness when he told them a breakaway group of the Official IRA opened fire on the British army on Bloody Sunday.
Mr Liam O'Comain, a former member of the Official IRA told the Inquiry that he had lied to Sunday Times northern editor Mr Liam Clarke and his wife Ms Kathryn Johnston because he believed they were "doing a hatchet job" on Irish republicanism.
Mr O'Comain, who was a source for their book: Martin McGuinness: From Guns to Government, had told them: "There was an element within the Officials that definitely made a decision to open up on Bloody Sunday and they did."
A transcript of Mr O'Comain's interview with the two journalists was submitted by Ms Johnston to the Inquiry last year.