Luigi Mangione, the accused UnitedHealthcare CEO killer who sparked a multi-state manhunt after allegedly gunning down the executive in Midtown Manhattan, was never read his Miranda rights when he was apprehended in Pennsylvania, his attorneys claimed in a bombshell court filing Saturday.

According to his lawyers, cops in Altoona, Pa., also went through Mangione’s backpack without a warrant after he was tracked down to a McDonald’s days after the Dec. 4 killing.

The gun Mangione allegedly used, as well as some ammunition, were found in that backpack, officials said.

The latest claims were brought forth as attorneys for Mangione, 27, asked a Manhattan federal judge to dismiss the evidence found in the backpack , in addition to any statements he made to police after he was taken int

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