Police are asking any witnesses, or anyone who may have information about the attack on the 13-year-old girl to contact them. The victim was raped at around 9pm on Saturday, 30 November.
Anyone with information is asked to call Crimestoppers anonymously on 0800 555 111.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants