The Murder of UnitedHealthCare CEO Brian Thompson Carried Out By Alleged Gunman Luigi Mangione. In the pre-dawn hours of December 4, 2024, the CEO of UnitedHealthCare, Inc. Brian Thompson was shot and killed on a Manhattan sidewalk just outside the New York Hilton Hotel where he was scheduled to speak at an annual investors' meeting. A 5 day manhunt ensued resulting in 26 year old Luigi Mangione being taken into custody after being recognized by an employee at ...