Luigi MangioneStephen Yang-Pool/Getty Images Tap Here To Add Us Weekly As A Trusted Source Add as a preferred source on Google Accused killer Luigi Mangione allegedly started a to-do list after the murder of UnitedHealthcare CEO Brian Thompson, a veteran police officer testified in court on Monday, December 8. Christy Wasser of the Altoona Police Department in Pennsylvania said during a pretrial hearing in New York City that she found a red notebook inside Mangione's backpack while he was being arrested at a McDonald's on December 9, 2024.