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Luigi Mangione seeks to exclude a 9mm gun and handwritten diary prosecutors say link him to UnitedHealthcare CEO Brian Thompson’s killing.

His lawyers argue police illegally searched his backpack without a warrant, a potential violation that could exclude critical evidence of motive and guilt.

The suppression hearings begin as the December 4 killing’s first anniversary approaches; Mangione faces life imprisonment or federal death penalty charges.

NEW YORK — Luigi Mangione appeared in court Monday seeking to bar evidence from his state trial over the killing of UnitedHealthcare CEO Brian Thompson, including the gun that authorities say matches the one used in the brazen New York

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