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.

Because of the federal charges he faces, Luigi Mangione is now eligible for the death penalty if he is found guilty. Last night, the prosecution filed a formal notice to seek the death penalty, just hours before today's plea hearing. Mangione’s legal team previously hit out at the decision, claiming it is political.