Luigi Mangione is expected to plead guilty Friday to federal charges accusing him of stalking and killing UnitedHealthcare CEO Brian Thompson, sources familiar

Luigi Mangione is expected to plead guilty Friday to federal charges accusing him of stalking and killing UnitedHealthcare CEO Brian Thompson, sources familiar with the matter told ABC News. ABC News' Aaron Katersky is outside the courthouse. [▻](https://video.twimg.com…