Luigi Mangione made several diary entries that reveal his thoughts prior to the December shooting of UnitedHealthcare CEO Brian Thompson , of which he is accused, New York City prosecutors claim in a new court filing.

The filing, submitted Wednesday, June 4 and obtained by PEOPLE, quotes the diary entries Mangione made in the months leading up to the shooting, which were found in a red notebook he was carrying at the time of his arrest in Altoona, Pa.

The alleged entries reveal that he seemingly considered what the public reception to such a high-profile crime would be.

“I finally feel confident about what I will do,” Mangione is alleged to have written in an August 2024 entry, according to prosecutors. “The details are coming together. And I don't feel any doubt about whether it

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