Luigi Mangione pleaded not guilty Friday to a federal murder charge in the killing of UnitedHealthcare CEO Brian Thompson. Prosecutors formally declared their intent to seek the death penalty, and the judge warned Justice Department officials to refrain from making public comments that could spoil his right to a fair trial.

Luigi Mangione pleaded not guilty Friday to the murder of UnitedHealthcare CEO Brian Thompson in his federal death penalty case — as a judge warned government prosecutors to tell their bosses to

Diehard Luigi Mangione fans protested the feds’ death penalty case against the accused murderer-turned-folk hero Friday — as he pleaded not guilty to the cold-blooded killing of UnitedHealthcare CEO Brian Thompson.