Luigi Mangione admits to shooting UnitedHealthcare CEO: 'I knew what I was doing'

Luigi Mangione in an earlier appearance in state court, ahead of a scheduled murder trial. The Ivy League graduate pleaded guilty to separate stalking charges in federal court. David Dee Delgado-Pool/Getty Images Luigi Mangione pleaded guilty to stalking charges in federal court in a striking reversal. In the hearing, Mangione described tracking down and shooting UnitedHealthcare CEO Brian Thompson. A judge will sentence him on December 18. The federal charges carry a possibility of life in…