Video: Stephen Lawrence murder: how the case changed policing June 23, 1993: Luke Knight charged with murder. July 29, 1993: Charges against Neil Acourt and Knight dropped. September 1994: The Lawrence family begins a private prosecution. April 25, 1996: The case collapses at the Old Bailey. Neil Acourt, Luke Knight and Gary Dobson are acquitted. February 13, 1997: Inquest into Stephen's death ends and the jury decides he was "unlawfully killed by five white youths." July 31, 1997: Home Secretary announces a judicial inquiry by Sir William Macpherson. September 1998: Macpherson accuses the Metropolitan Police of "institutional racism." October 1998: Police give an apology to the Lawrence family and promise to eradicate racism in the force. February 1999: The Macpherson report gives 70 recommendations for changes in policing. October 2000: Lawrences accept £320,000 compensation from police. May 5, 2004: CPS says there is "insufficient evidence" to prosecute anyone for Stephen's murder. April 2005: The double jeopardy legal principle, preventing suspects being tried twice for the same crime, is scrapped. November 8, 2007: Police confirm that they are investigating new forensic evidence in the case. February 2009: A report by Dr Richard Stone, who was a member of the Macperhson inquiry, says the police have made significant progress in reforming but charges of racism remain. December 2009: A 62-year-old retired constable and a 53-year-old member of police staff were arrested on suspicion of perverting the course of justice in relation to the alleged non-disclosure of material. May 18, 2011: Announced that two of the original suspects were to stand trial for the murder in the light of new evidence becoming available. November 15, 2011: trial starts January 3, 2011: Gary Dobson and David Norris were found guilty of Lawrence's murder.