Suspect in CEO's Murder Linked to Ghost Gun and Manifesto

UnitedHealthcare CEO Brian Thompson was allegedly killed with a 'ghost gun,' a type of untraceable firearm often made using 3D printing or parts kits. These guns lack serial numbers, making them difficult to trace and increasingly used in crimes. Authorities are concerned about their growing prevalence, with efforts underway to regulate them, including a 2022 Justice Department rule requiring serial numbers and background checks for parts kits. The U.S. Supreme Court is reviewing the rule's legality.