Luigi Mangione wrote about plans to kill UnitedHealthcare CEO Brian Thompson in his diary months before the healthcare executive was gunned down in New York City last year, state prosecutors alleged in a Wednesday court filing. Mangione, a 27-year-old who has pleaded not guilty to state and federal charges in connection with the December murder, allegedly used a red notebook as a diary to document his plans to kill Thompson, the court filing states. The notebook was confiscated by authorities during Mangione's arrest in Pennsylvania after a five-day manhunt for Thompson's killer.

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