Luigi Mangione attends a pretrial hearing at New York State Supreme Court on September 16. Steven Hirsch/New York Post/Bloomberg/Getty Images New York AP —

Lawyers for Luigi Mangione asked a New York federal judge Saturday 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’s chief executive .

In papers filed 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 where 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 Brian

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