Chilling details in a notebook found by police in the possession of Luigi Mangione, the 26-year-old accused of killing UnitedHealthcare’s chief executive Brian Thompson, sheds new light on the calculated nature of the crime.

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The notebook, described by investigators as a critical piece of evidence, reportedly details a meticulously planned attack targeting a corporate leader.

“What do you do? You wack the CEO at the annual parasitic bean-counter convention. It’s targeted, precise, and doesn’t risk innocents,” reads one passage from the spiral notebook, according to law enforcement officials.

According to CNN the notebook also contained “to-do lists of tasks that needed to be completed to facilitate a killing, as well as notes justifying those plans.” Another passage reportedly references the Unabomber, Ted Kaczynski.

Thompson was fatally shot one week ago as he arrived at a Hilton hotel on West 54th Street in Manhattan. He had been preparing for UnitedHealthcare’s annual investors’ day, a high-profile event attracting top executives and financial analysts.

Mangione’s arrest came days later, thanks to a tip from an Altoona,

Pennsylvania McDonald’s employee. The suspect was recognized by a customer who had seen his image circulating in connection to the crime. Upon his capture, Mangione was found with a ghost gun, a suppressor, and false identification, items investigators believe were central to executing his plan. He was also carrying identification under his real name.

Adding to the mounting evidence, a handwritten 262-word note which authorities described as a manifesto was found on Mangione. The statement began by taking responsibility for the killing and referenced the notebook.

Mangione, who is facing a murder charge, is currently fighting extradition to New York.