Nicola Edgington has been found guilty of the murder of grandmother Sally Hodkin and the attempted murder of another woman, Kerry Clark in a knife attacks in Bexleyheath in 2011.
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The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.
In a statement Charlton Athletic said: Keith was a true hero who will be greatly missed by all the Charlton family and everyone at the club.
London and the worlds has united on Twitter in defiance of the West minster attack #prayforlondon #wearenotafraid