Luigi Mangione pleaded not guilty in New York federal court to the murder of UnitedHealthcare CEO Brian Thompson. Mangione faces a possible death sentence in the case if he is convicted of murdering Thompson,

Luigi Mangione on Friday pleaded not guilty to federal stalking and first-degree murder charges in the death of UnitedHealthcare CEO Brian Thompson in December.

Luigi Mangione, the 26-year-old accused of killing UnitedHealthcare CEO Brian Thompson, pleaded not guilty Friday to all federal charges against him in the case, including murder, two counts of stalking and a firearms offense.