New court filings reveal diary entries written by Luigi Mangione, the Ivy League graduate who's charged with the shooting and killing of the CEO of United Healthcare outside a busy Manhattan hotel.

Mangione had a notebook in which he vented about his frustrations with the health insurance industry and his intent to carry out an attack.

The entries also shed light on Mangione's focus on the court of public opinion.

The diary has become central to the state case against Mangione, which charges him with first-degree murder and murder as an act of terrorism, among other offenses. Prosecutors have quoted from the diary to emphasize the alleged premeditated nature of the crimes, saying the notes convey one clear message: that the murder of Brian Thompson was intended to bring about revolution

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