Computer hacker Gary McKinnon will find out later today whether the Home Secretary Theresa May will halt his extradition to America.
Mr McKinnon, who has Asperger's syndrome, faces trial in the US over hacking into military files over a decade ago.
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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