Luigi Mangione's lawyers asked a New York judge to dismiss some criminal charges, including the only count for which he could face the death penalty, from a federal indictment brought against him in the December assassination of UnitedHealthcare CEO Brian Thompson .

In papers filed Saturday in Manhattan federal court, the lawyers said prosecutors should also be prevented from using at trial his statements to law enforcement officers and his backpack, in which a gun and ammunition were found.

They said Mangione was not read his rights before he was questioned by law enforcement officers, who arrested him after Thompson was fatally shot as he arrived at a Manhattan hotel for an investor conference on Dec. 4, 2024.

They added that officers did not obtain a warrant before searching

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