Three people have been treated for minor injuries after a set collapsed during a performance of Fuerzabruta at Camden's Roundhouse.
London Ambulance was called at 19:48 on Friday evening and the three people were taken to the Royal Free Hospital.
One sustained facial injuries, one an ankle injury and the other suffered concussion.
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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