Luigi Mangione, the Maryland man accused of hunting down and killing a UnitedHealthcare CEO over what prosecutors said was "hostility toward the health insurance industry," pleaded not guilty at his Manhattan federal court arraignment on Friday to what could be death penalty charges.

Luigi Mangione, the 26-year-old accused of killing UnitedHealthcare CEO Brian Thompson, pleaded not guilty Friday to all federal charges against him, and his attorney said she’d request that his federal case go to trial before his state cases.