UnitedHealthcare shooting suspect faces federal murder charge

• Mangione was charged with murder through use of a firearm, two counts of stalking and a firearms offense, according to the federal complaint.
• The complaint was unsealed just after Mangione waived extradition to New York from Pennsylvania, where he had been held since his arrest last week.

Driving the news: The complaint alleged that the notebook authorities said Mangione possessed "contained several handwritten pages that express hostility towards the health insurance industry and wealthy executives in particular."

• Per the filing, an August 15 entry in the notebook says "the details are finally coming together" and that "I'm glad – in a way – that I've procrastinated," because it allowed "me to learn more about" a company name that was redacted by prosecutors.
• The notebook entry also stated that "the target is insurance" because "it checks every box." Prosecutors also allege the writings in the notebook referenced the investor conference Thompson was set to attend the day of his death.
• "This investor conference is a true windfall . . . and – most importantly – the message becomes self evident," an Oct. 22 passage read, per the complaint.

Catch up quick: The 26-year-old was arrested last week after a days-long search that drew nationwide attention.

• After being indicted by a New York grand jury on charges including first-degree murder, Mangione faces a maximum penalty of life in prison without parole.
• The Manhattan District Attorney's office said in a statement that the New York case and the federal case will "proceed in parallel."

What's next: Mangione arrived in New York Thursday afternoon and is expected to appear in federal court in Manhattan later today.

Go deeper: America obsesses over Luigi Mangione's digital footprint