A document submitted by prosecutors as evidence reveals the planning behind the killing of the CEO of UnitedHealthcare and details the perpetrator’s motives. The document, a letter authored by Luigi Mangione, expresses a harsh critique of the American healthcare system. Mangione reportedly believed his targets "deserved" what happened to them, referring to them as “parasites.” Prosecutors are using the letter to demonstrate premeditation in the case. The details within the letter shed light on the attacker’s mindset and his reasoning for targeting individuals connected to the healthcare industry in the United States. This evidence is central to the ongoing legal proceedings regarding the UnitedHealthcare CEO’s death. The letter highlights a deeply rooted anger towards the structure and practices of the American healthcare system.