Luigi Mangione, charged in the December ambush shooting of UnitedHealthcare CEO Brian Thompson, is indeed a terrorist, a New York prosecutor said in a court filing Wednesday night. Some 40 UHC executives were so afraid after the murder that they enlisted bodyguards, the prosecutor argued in an 82-page rebuke of defense lawyers' efforts to get Mangione's state terrorism charge dropped. One exec who received death threats dyed her hair and moved to a temporary home out of fear she might be harmed next, the new court filing said.