Ian Tomlinson: 'Another whitewash' claim
Vivian Figuiredo, 27, said watching Mr Tomlinson's family in tears was like "reliving" her cousin's death at the hands of Met firearms officers.
Ms Figuiredo was lending her support five years to the day since Mr de Menezes was shot dead on a Stockwell Tube carriage.
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Hide AdShe joined dozens of campaigners in a protest for Mr Tomlinson at New Scotland Yard, in central London.
Ms Figuiredo said: "It's the same situation as Jean Charles – another Scotland Yard whitewash.
"They have been failed very badly, just as much as my family were."
She added: "I understand exactly what the family are going through. We are so disappointed for them but they must not give up hope."