Luigi Mangione, accused of killing UnitedHealthcare CEO Brian Thompson last year, is undergoing pretrial hearings in Manhattan where prosecutors are presenting key evidence.A notebook found in Mangione's backpack revealed his animosity toward health insurers, explicit intentions to kill a CEO, and detailed plans for evasion, including altering his appearance and travel routes.His defense team argues police interrogated him for nearly 20 minutes before issuing Miranda rights, seeking to suppress statements and evidence from his backpack, which contained weapons and the manifesto.