PC Blakelock murder case timeline
PC Keith Blakelock was stabbed to death in the Broadwater Farm riot in Tottenham, north London, on 6 October 1985. The hunt to find his killer has lasted for nearly 30 years.
5 October: Broadwater Farm resident Cynthia Jarrett dies of heart failure after four policemen burst into her home during a raid. Police say they were looking for stolen property, but found none.
- Mrs Jarrett's family meet the police to discuss her death and demand an inquiry. They make it clear they do not want any kind of public disorder.
- The trouble starts at about 18:45 GMT when police are called to Mount Pleasant, Willan Road and The Avenue.
- Police are pelted with bottles and petrol bombs, cars are overturned and there is widespread looting.
- About 500 police officers with shields, helmets and truncheons battle with rampaging youths who throw objects from walkways.
- By midnight, 58 policemen and 24 other people have been taken to hospital.
- At about 22:15 GMT, PC Keith Blakelock is stabbed in the neck, suffering serious injuries. He later dies in hospital.
Winston Silcott, Mark Braithwaite and Engin Raghip go on trial for the murder of PC Blakelock and are convicted.
Three youths are also charged with murder but do not face trial after a judge rules their questioning is inadmissible.
All three convictions are overturned on appeal after scientific tests show Silcott's confession was fabricated.
Silcott receives £17,000 in compensation for wrongful conviction
Silcott begins proceedings against the Met claiming damages for malicious prosecution.
Two police interrogators - former Det Ch Supt Graham Melvin and ex-Det Insp Maxwell Dingle - are cleared at the Old Bailey of perverting the course of justice over concerns about fabricating evidence. The Independent reports they had been charged two years previously and suspended from their jobs.
Silcott is granted up to £200,000 in legal aid to sue the Met for conspiracy to pervert the course of justice and abuse of position, but in 1996 the Court of Appeal blocks the action.
March: The Met says it will review key evidence in light of new forensic science methods, including DNA testing.
October: Winston Silcott receives £50,000 from the Metropolitan Police in an out-of-court settlement over false imprisonment and malicious prosecution. But the Met do not admit liability for malicious prosecution.
The three sons of PC Blakelock say they plan to sue Silcott over their father's murder. The Blakelock family hope fresh evidence will form the basis of their civil suit.
October: Winston Silcott, who was wrongly accused of the murder of PC Blakelock, is released from prison after serving 17 years for the killing of boxer Anthony Smith.
December: Police say new information has come to light about the murder of the officer and they could be carrying out DNA tests on exhibits. The inquiry is restarted.
September: Officers search the back garden of a terraced house on the Broadwater Farm estate in Tottenham and recover "one item".
October: The uniform of PC Blakelock is removed from Scotland Yard's crime museum for forensic examination.
In October Elizabeth Johnson, the widow of PC Blakelock, appeals for information about the murder on the anniversary of his death. Police also release images of the policeman's blood-stained overalls with tape surrounding the holes made by the knife used to attack him.
Days later a man, from Enfield, is arrested, questioned and later bailed over the murder.
February: A 40-year-old man, originally from Tottenham, is arrested in Suffolk on suspicion of murdering PC Blakelock and later bailed.
June: Two men are arrested on suspicion of murder and later bailed.
October: On the 25th anniversary of PC Blakelock's death the Met says they have arrested 10 people as part of the murder inquiry in that year so far.
The Met arrested a total of 14 people in 2010 on suspicion of involvement in the murder of PC Keith Blakelock or attempted murder of PC Richard Coombes who was beaten unconscious during the rioting. Nine were released without charge in August 2011.
23 July: Four of the men arrested in 2010 are released without charge due to "insufficient evidence to warrant a prosecution" police say. The only other man arrested in 2010 is, Nicholas Jacobs, 44, of Hackney, who is charged with PC Keith Blakelock's murder. He would have been 16-years-old when the officer was killed.
November: Nicolas Jacobs pleads not guilty to the officer's murder.
3 March: The trial of Nicholas Jacobs, 45, who is accused of the murder of PC Blakelock, begins at the Old Bailey. The jury is told the officer had been stabbed more than 40 times and the group tried to decapitate him.
9 April: Nicholas Jacobs is cleared of murdering PC Blakelock at the Old Bailey by a majority jury. After four hours of deliberations, Mr Jacobs was found not guilty of murder and manslaughter.