Luigi Mangione Pleads Not Guilty to Federal Murder Charge at NYC Hearing

FBI agents tracking Luigi Mangione as he allegedly killed UnitedHealthcare CEO Brian Thompson in 2015. Mangione has pleaded not guilty to four federal charges, including murder via firearm, following his arraignment last week. Federal prosecutors seek the death penalty, while his team opposes it, with both sides set to present their cases this month ahead of a trial that could determine whether Thompson's killers face justice.