A notebook found on 26-year-old Luigi Mangione after his arrest earlier this week describes the assassination of UnitedHealthcare CEO Brian Thompson, law enforcement officials told The New York Times. The spiral notebook authorities say belongs to Mangione includes a passage where the writer mentions taking out “the CEO at the annual parasitic bean-counter convention.” Thompson was gunned down in Midtown Manhattan on December 4 while he was on his way to the UnitedHealth Group’s Investor’s Conference. “It’s targeted, precise, and doesn’t risk innocents,” Mangione allegedly wrote in the notebook. The suspect considered using a bomb but wrote in his notebook that it “could kill innocents,” CNN reported. According to authorities, Mangione was also in possession of a 262-page manifesto where he allegedly called out “United” and wrote, “To save you a lengthy investigation, I state plainly that I wasn’t working with anyone.” NYPD Commissioner Jessica Tisch said on Wednesday that a water bottle and Kind snack bar wrapper recovered by police near the crime scene contained fingerprints that match those of Mangione. Tisch also noted that three shell casings recovered at the scene of the crime matched the homemade gun found on Mangione when he was arrested. The 9mm shell casings from the scene of Thompson’s assassination had the words “delay,” “deny,” and “depose” written on them, according to NYPD Chief of Detectives Joseph Kenny. It was initially reported that the words on the shell casings were “defend,” “deny,” and “depose” before police clarified. Mangione is being held on firearm and forgery charges in Pennsylvania and fighting his extradition to New York, where he is charged with second-degree murder. The 26-year-old Ivy League graduate had to be restrained by deputies on his way to his extradition hearing on Tuesday as he yelled at the reporters gathered outside the courthouse. Mangione’s lawyer, Thomas Dickey, told CNN on Wednesday that his client is “irritated” and “agitated about what’s happening to him and what he’s being accused of.” Dickey questioned the NYPD’s fingerprint and ballistic evidence, saying, “Those two sciences, in and of themselves, have come under some criticism in the past, relative to their credibility, their truthfulness, their accuracy, however you want to do it.” CHECK OUT THE DAILY WIRE HOLIDAY GIFT GUIDE The assassin waited near the Hilton hotel in Midtown Manhattan before approaching Thompson from behind and shooting him multiple times, surveillance video shows. Police found a homemade gun and suppressor on Mangione when he was arrested at an Altoona, Pennsylvania, McDonald’s last week. Police connected the suspect, who was masked when he allegedly assassinated Thompson, to surveillance footage of a man seen smiling in a Manhattan hostel. The suspect reportedly showed a fake New Jersey ID at the hostel when he booked a room there in November. When Mangione was questioned by Altoona police last week, he allegedly showed them the same fake New Jersey ID.