Luigi Mangioni is accused of assassinating United Healthcare CEO Brian Thompson in New York City, sparking concerns about domestic extremism. Mangioni, who was captured in Pennsylvania, faces state terrorism charges and could be eligible for the death penalty. Prosecutors allege Mangioni intended to incite terror, and federal authorities view the incident as indicative of broader domestic extremism issues. A notebook seized by police revealed Mangioni's hostility towards the health insurance industry and wealthy executives. The crime has fueled public anger towards the health insurance sector, with Homeland Security Secretary Alejandro Mayorkas expressing concern over the violent rhetoric on social media. The Center for Internet Security warned that online support for Mangioni might inspire copycat attacks. Mangioni's attorney described the concurrent federal and state charges as unusual and is prepared to contest them in court.