Erica Byfield sits down with Lester Holt to discuss a new episode of “Dateline” taking an in-depth look at the execution-style murder of UnitedHealthcare CEO Brian Thompson that has caught worldwide attention. In the episode “A Killing in Midtown,” Holt spoke with a friend and colleague of Thompson's, who called the "hero" worship of alleged killer Luigi Mangione "cruel." For the full interview, check out "The Case: Luigi Mangione" wherever you get your podcasts. #dateline #nbc4ny #luigimangione