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'Dateline' NBC Exclusive: Lester Holt has inside look into Luigi Mangione investigation
Posted
June 4, 2026
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June 4, 2026
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4:15Now PlayingFriday's all-new Dateline goes inside the Luigi Mangione investigation, revealing exclusive new details and insight into the case that continues to captivate the world.
For the first time, two NYPD Major Case Squad detectives who worked on the investigation take Dateline through the lead-up to the murder of UnitedHealthcare CEO Brian Thompson and the urgent manhunt that followed.
Retired Detective Sergeant John Griffin tells Dateline anchor Lester Holt about his first reaction to seeing the weapon used in the killing: “It had something on the front, like a homemade suppressor or silencer-type thing.”
Asked by Holt whether that was common, Griffin responded: “No. In 25 years, I don’t think I’ve ever actually encountered a silencer before that.”
Click here to watch the exchange
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