The suspect in the murder of UnitedHealthcare’s CEO, Brian Thompson, Luigi Mangione, is facing new criminal charges at New York City, including committing an act of terrorism.

The Manhattan district attorney, Alvin Bragg, and the NYPD commissioner, Jessica Tisch, jointly announced charges against the 26-year-old Mr. Mangione during a press conference on Tuesday afternoon, including first-degree murder, in furtherance of terrorism and two counts of second-degree murder, one specifically relating to a terroristic act.

“We allege that Luigi Mangione carried out the brazen, targeted and fatal shooting of United Healthcare CEO Brian Thompson in Midtown Manhattan. This type of premeditated, targeted gun violence cannot and will not be tolerated, and my office has been working day in and day out to bring the defendant to justice,” Mr. Bragg said, adding that he faces life in prison without the possibility of parole.

The new charges come as Mr. Mangione is due back in a Pennsylvania court on Thursday for a hearing on extradition back to New York State. He is also facing charges at Huntingdon County for allegedly possessing a ghost gun when he was apprehended at a McDonald’s at Altoona on December 9.

He is alleged to have laid in wait outside a midtown Manhattan hotel where Thompson was staying during the early morning hours of December 4 and approached him from behind and fatally shooting him execution-style.

Social media posts have reflected a high level of sympathy for Mr. Mangione, calling him a “martyr” for railing against a healthcare system perceived to hurt more people than hit helps.

A shocking Emerson poll found that Mr. Mangione had overwhelming public support from young voters for his alleged actions with 41 percent of those aged 18 to 29 found his possible actions as “acceptable” and another 24 percent found it “somewhat acceptable.”