Desmond Brooks, 40, was remanded in custody when he appeared at Camberwell Magistrates' Court today charged with the murder of a woman and the attempted murder of two others in Brixton, south London.
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The ComRes survey for ITV News and LBC showed the Labour candidate increasing his overall lead over Conservative rival Zac Goldsmith.
The latest poll for ITV London and LBC shows Sadiq Khan leads Zac Goldsmith by 45% to 36% on first preference votes.
Corbyn was unveiling a poster less than a mile away as Khan gave his final campaign speech to party supporters in London.