Mangione was charged with one count of murder in the first-degree and two counts of murder in the second-degree in connection with the fatal shooting of Thompson on December 4, along with other weapon and forgery charges, the indictment says.
Bragg is expected to announce the indictment at a 3:30 p.m. news conference.
The 26-year-old is not going to fight extradition to New York, his lawyer Karen Friedman Agnifilo told CNN. He is set to appear in a Pennsylvania court for an extradition hearing on Thursday during which a judge will rule on the next steps for him to return to New York to face the indictment.
If convicted of second-degree murder in New York, Mangione would face 15 years to life in prison, while a first-degree murder charge carries a sentence of 20 years to life.
A charge of murder in the first degree is rare because it requires special elements related to the crime to be charged.
Under New York law, murder in the first-degree only applies to a narrow list of aggravating circumstances, including when the victim is a judge, a police officer or a first responder, or when the killing involves a murder-for-hire or an intent to commit terrorism, CNN has reported.
Investigators in New York believe Mangione, a former high school valedictorian and Ivy League graduate born into a well-to-do family, appeared to be driven by anger against the health insurance industry and “corporate greed,” according to an NYPD intelligence report obtained by CNN.
He’s scheduled to appear at a hearing in Pennsylvania Thursday in response to his petitions for writ of habeas corpus and imposition of bail, court documents show. The habeas corpus petition is a key factor in whether Mangione can be extradited to New York.