New evidence released in Luigi Mangione's pretrial hearing one year since his arrest

Luigi Manion back in court today. You can actually see him sitting next to his defense team this morning, which is day five of this major pre-trial hearing. And it comes exactly one year since Manion was arrested inside of a Pennsylvania McDonald's after a 5-day national manhunt.>> They says newly released evidence photos show a closeup of a silencer on the gun prosecutors say Manion allegedly used to kill United Healthcare CEO Brian Thompson. NBC News correspondent Ellison Barber following the latest for S ...