Mangione, 27, who has pleaded not guilty to state and federal murder charges for the killing of UnitedHealthcare CEO Brian Thompson last December, entered the courtroom on Monday in a gray suit. Officers removed his handcuffs during the appearance, as a few dozen Mangione supporters watched the hearing from the back of the courtroom.

Alleged gunman faces nine charges including second-degree murder in New York state case

Lawyers for Luigi Mangione are seeking to have evidence gathered during his arrest thrown out in his murder trial.