Luigi Mangione is believed to be a person of interest in last week's deadly shooting of UnitedHealthcare CEO Brian Thompson, police said Monday. The 26-year-old was arrested on firearms charges in Pennsylvania, where New York police detectives were heading to interview him amid a massive manhunt for the shooter.

Luigi Mangione, who comes from a wealthy Baltimore family, founded an app and reviewed the Unabomber Manifesto.

Luigi Mangione shouted and struggled against escorting officers as he was led into court on Tuesday, where he was denied bail; his attorney intends to file a writ of habeas corpus.