Luigi Mangione has pleaded not guilty to the fatal shooting of UnitedHealthcare CEO Brian Thompson. Photo: AP PHOTO

Luigi Mangione's lawyers have urged a federal judge in New York to block prosecutors from seeking the death penalty for their client, who is charged with killing UnitedHealthcare CEO Brian Thompson.

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In a court filing, Mangione's lawyers argued that US Justice Department officials should be precluded from seeking the death penalty because of actions that had violated his due process rights.

They said these included "staging a dehumanising, unconstitutional 'perp walk'

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