Aminur Nazir Khan, who's nineteen, will appear at Thames Magistrates' Court today.
He is charged with the murder of 16-year-old Ajmol Alom who died of a stab wound to his thigh.
Detectives have also arrested a second 19-year-old man on suspicion of murder.
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Transport for London says the woman fell down the gap while getting off the Tube.
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