ABC World News Tonight with David Muir S2024E326 - Episode 326

Aaron Katersky has the latest on the investigation into United Healthcare CEO Brian Thompson's murder, including investigators' first forensic match allegedly connecting suspect Luigi Mangione to the crime and what sources say detectives consider to be Mangione's confession; Mary Bruce has details on FBI Director Christopher Wray announcing he will resign before President-elect Trump takes office in January; Erielle Reshef reports on lawmakers sounding the alarm over the swarm of mysterious drones — sometimes dozens at a time — appearing in the sky in the Northeast, with officials calling for immediate action by federal authorities; and more on tonight's broadcast of World News Tonight with David Muir.