Here are some of the key dates in the decades-long campaign for justice by the families of civilians killed by soldiers in Londonderry in January 1972.
January 30 1972
The Parachute Regiment opens fire on a crowd taking part in a civil rights march in Derry.
Some 13 were killed outright while a 14th man later died of his wounds.
An inquiry led by Lord Chief Justice Lord Widgery supported the soldiers’ version of events that they were returning fire.
First meeting of the Bloody Sunday Justice Campaign.
Campaign writes to then prime minister John Major seeking full independent inquiry.
Mr Major refuses because there has already been a public inquiry held by Lord Widgery.
A 40,000 strong petition was delivered by the campaign to 10 Downing Street calling for a new inquiry.
January 29 1998
Then prime minister Tony Blair announces a new inquiry.
November 2000-September 2002
Inquiry hears oral evidence.
Soldiers announce they would seek a judicial review of the decision of inquiry that military witnesses must give their evidence in Derry.
The Court of Appeal rules that the soldiers can give evidence in London.
September 2002-October 2003
Inquiry is held in Methodist Central Hall, Westminster.
October 2003-November 2004
Inquiry moves back to Derry.
Lord Saville delivers his findings that there was no justification for shooting any of those killed or wounded. Prime Minister David Cameron issued a public apology saying the killings were “unjustified and unjustifiable”.
The first compensation settlement in relation to Bloody Sunday victims is awarded.
March 14 2019
The Public Prosecution Services announces one former soldier, known as F, will be prosecuted for the murders of James Wray and William McKinney and the attempted murders of Joseph Friel, Michael Quinn, Joe Mahon and Patrick O’Donnell in Londonderry in 1972.
Sixteen other former soldiers and two suspected ex-members of the Official IRA, all of whom were also investigated as part of a major police murder probe, will not face prosecution.
Protests in support of Soldier F take place across the UK.
September 18 2019
The case against Soldier F is heard in court for the first time at a sitting of Derry Magistrates’ Court.
The veteran was not present in court for the short hearing.
January 17 2020
A judge orders that the first major hearing in the trial will take place in Belfast because of security fears.
The families of the victims argued the trial should sit in Derry.
April 22 2021
The families of five of the men killed announced they will legally challenge the decision of the PPS not to prosecute five veterans.
The families of Jackie Duddy, Michael Kelly, John Young, Michael McDaid and William McKinney were granted permission by the High Court to challenge decisions not to prosecute five other former members of the Parachute Regiment.
The judicial review has been listed for September.
July 2 2021
The PPS announces it is discontinuing the prosecution of Soldier F over fears the case could collapse in light of a recent court ruling that caused the collapse of another Troubles murder trial involving two military veterans.