Luigi Mangione, the alleged shooter behind the killing of UnitedHealth CEO Brian Thompson, pleaded not guilty to 11 charges in court, including murder and terrorism. MSNBC’s Ari Melber reports on the systematic issues at the center of the killing and is joined by former health insurance executive Wendell Potter. (The Beat's YouTube playlist: https://msnbc.com/ari Ari: / arimelber Beat merch: www.msnbc.

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