Luigi Mangione, the man accused of murdering UnitedHealthcare CEO Brian Thompson, is set to waive extradition and return to New York to face charges. Mangione, who was captured in Pennsylvania, is expected to be transferred to New York, where prosecutors have upgraded the charges to first-degree murder in furtherance of terrorism.

Before the transfer can take place, a Pennsylvania judge must approve the waiver or hold a hearing on any local charges. If the process goes as expected, Mangione could be arraigned in New York as early as Thursday.

This high-profile case has drawn national attention, with a special edition of "20/20" set to explore the details of the murder, the manhunt, and the eventual capture of Mangione. Prosecutors' decision to file terrorism-related charges suggests a broader motive may be at play, adding to the seriousness of the case.

The public will be watching closely as Mangione’s extradition and arraignment unfold, with the potential for new details to emerge in what could become a pivotal criminal trial.