Luigi Mangione, who is being charged with the Dec. 4 murder of UnitedHealthcare CEO Brian Thompson, apparently kept a diary of sorts.

For Starters, Kill A CEO

"What do you do? You wack the C.E.O. at the annual parasitic bean-counter convention. It's targeted, precise and doesn't risk innocents," was one passage in the notebook, officials said. 

Thompson was shot and killed outside a UnitedHealth Group Inc (NYSE:UNH) investor day event. UnitedHealthcare is the insurance unit of UnitedHealth Group.

According to a New York Police Department internal report, which referred to Mangione’s note as a manifesto, the 26-year-old suspect viewed Thompson's murder as a "symbolic takedown," per the NY Times. The NYPD opined that Mangione "likely views himself as a hero of sorts who has finally decided to act upon such injustices" and expressed concern that others might see him as a "martyr and an example to follow."

Fingerprints Match Up

Lawyer Says No To Extradition

Mangione's lawyer, Thomas Dickey, denies his client's involvement in the New York murder, noted CNN, and says Mangione will likely plead not guilty to the murder charge, among other counts. Mangione also plans to plead not guilty to Pennsylvania charges related to the gun and fake ID police found on him, Dickey said.

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Photo courtesy of Pennsylvania State Police.