PC Keith Blakelock died during riots on the Broadwater Farm estate in Tottenham, north London, on 6 October 1985.
Twenty-eight years later, a new suspect - 44-year-old Nicholas Jacobs - has been charged with the officer's murder.
- PC Blakelock, 40, was stabbed to death as he tried to protect firefighters tackling a blaze at a supermarket at the height of the unrest
- Three men - Winston Silcott, Mark Braithwaite and Engin Raghip - were convicted in March 1987 of Blakelock's murder
- All three convictions were quashed four and a half years later, after forensic tests on pages of key interview records suggested they had been fabricated
- Scotland Yard reopened the murder investigation in 2003 after a review indicated there were possible new lines of inquiry
- In 2010, 14 men were arrested in connection with PC Blakelock's death and the attempted murder of his colleague PC Richard Coombes
- Nine were told in August 2011 that they would face no further action, and the rest except Jacobs have now been released.
More top news
At least 100 people have been killed in Pakistan after an oil tanker overturned and burst into flames, according to reports.
Authorities call for government to step up funding in the wake of the Grenfell fire to help evacuate and renovate other blocks.
Donald Trump has accused Barack Obama of failing to take action over Russia's alleged interference in the US election.