Luigi Mangione, 26, appeared in a New York court facing federal charges, including murder, for the December 4 shooting of UnitedHealthcare CEO Brian Thompson. The case has ignited public discussions about the failures of the US healthcare system. Supporters of Mangione gathered outside the courthouse, emphasizing systemic frustrations, but authorities, including the FBI, condemned his actions as premeditated violence. Federal charges come after New York state-level charges were also filed against him, raising complex legal questions about the dual proceedings.