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Mangione Diary Unveiled as Evidence Before New York Murder Trial

  • Brian Thompson, the CEO of UnitedHealthcare, was fatally shot on a crowded sidewalk in Manhattan on December 4, 2024, just minutes before an investor conference was set to begin.
  • The killing followed Luigi Mangione's extensive diary entries expressing anger at the health insurance industry and plans to intimidate its executives and employees.
  • After the killing, UnitedHealthcare and other insurers faced widespread threats, prompting heightened security including police protection, personal security for executives, and removal of executive images online.
  • Prosecutors allege Mangione committed first-degree murder to broadcast ideological intimidation, supported by his diary and a recovered red notebook showing his intent to provoke fear and revolution.
  • The incident triggered fear among staff, lawsuits, a sharp stock price decline, and a prolonged backlash affecting UnitedHealthcare’s reputation and operational stability.
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MedPage Today broke the news in New York, United States on Tuesday, June 3, 2025.
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