Police Have Suspect’s Notebook Describing Rationale for C.E.O. Killing

“It’s targeted, precise, and doesn’t risk innocents,” said a sentence in a spiral notebook belonging to the man charged with murdering Brian Thompson.

Luigi Mangione, who has been charged with killing the chief executive of UnitedHealthcare at a company investors’ day, was arrested with a notebook that detailed plans for the shooting, according to two law enforcement officials.

The notebook described going to a conference and killing an executive, the officials said.

“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 written in the notebook, the officials said.

The shooting of the executive, Brian Thompson, occurred early Dec. 4 as Mr. Thompson arrived at a Hilton hotel on West 54th Street to prepare for the UnitedHealthcare investors’ meeting. His assailant escaped on a bicycle and then disappeared.

Mr. Mangione, 26, was captured Monday after a tip from an employee at a McDonald’s in Altoona, Pa., who was alerted by a customer who recognized him.

Mr. Mangione, who faces a murder charge and has been denied bail, is fighting extradition to New York, which starts a process that could take weeks. “He is contesting it,” his lawyer, Thomas Dickey, said on Tuesday.