ABC News legal contributor Bernarda Villalona says plea negotiations for Mangione, who's charged in the shooting death of UnitedHealthcare CEO Brian Thompson, are "complex." ––– Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. https://abcnews.com Download the ABC News app for the latest headlines and alerts: https://abcnews.com/devices Connect with ABC