A man arrested Monday on a gun charge in Pennsylvania has been identified as the suspect in the “brazen, targeted” fatal shooting last week of UnitedHealthcare CEO Brian Thompson in Midtown Manhattan, according to New York police officials. Luigi Mangione, 26, was found at a McDonald’s in Altoona with a gun and a suppressor “both consistent with the weapon used in the murder,” New York Police Commissioner Jessica Tisch said at a news conference Monday, referring to a device that...