Luigi Mangione, the 26-year-old accused of killing UnitedHealthcare CEO Brian Thompson in New York on Dec. 4, waived his right to extradition Thursday morning in Blair County court in Pennsylvania.

New York City police officers escorted Mangione from the courthouse and flew him to New York, where he was arraigned earlier this week. He is expected to appear in New York state court for arraignment later Thursday or Friday.

Days after the shooting in midtown Manhattan, Mangione was identified at a McDonald’s in Altoona, Pennsylvania, where he was reported to local authorities and taken into custody. Since then, he has been held without bail in a Pennsylvania state prison on charges of state crimes including carrying a weapon without a license, forging documents, falsely identifying himself to authorities and possessing “tools of crime.”

According to a complaint unsealed on Thursday, federal authorities have now filed charges of murder, stalking and weapons possession against Mangione. It is unclear when he will appear in court on the federal charges.

By waiving his extradition hearing, Mangione has voluntarily agreed to put his criminal case in Pennsylvania on hold and return to New York for prosecution. The charges he faces in New York include murder as an act of terrorism, which carries a sentence of life in prison without the possibility of parole.

Why would Luigi Mangione want to forego extradition?

Although neither Mangione nor his New York attorney, Karen Friedman Agnifilo, have commented on the situation, David Sarni, a former NYPD detective and current associate professor at John Jay College of Criminal Justice, told Yahoo News it was not unusual for Mangione and Agnifilo would have filed a complaint in this case and would have to waive extradition.

“Extradition usually occurs when the case in the other state is more serious and the prosecution is willing to conduct the extradition hearing,” Sarni said.

Sarni said that since Mangione is facing more serious charges in New York, it wouldn’t be surprising if Pennsylvania was already planning to send him out of state.

The waiver of extradition prevents the Pennsylvania judge from having to consider the charges Mangione faces in that state. Waiving extradition in Pennsylvania will also begin the trial in New York more quickly than having to go through a trial in Pennsylvania first, Sarni said.

Will charges be dropped in Pennsylvania?

No, the Pennsylvania charge against Mangione still stands, although his charge in New York is more serious.

“They will probably put this case on hold,” Sarni said. “If they wanted to prosecute it and go back and extradite (Mangione) there from New York, they could do that too. But again, the severity of the charges he faces (in New York) are much more serious than under Pennsylvania common law.”

What is Luigi Mangione accused of in New York?

Mangione faces one count of first-degree murder in furtherance of terrorism and two counts of second-degree murder, including one that qualifies as an act of terrorism, Manhattan District Attorney Alvin Bragg said at a news conference Tuesday.

Bragg said one of the second-degree murder cases should be classified as an act of terrorism because “it was a frightening, well-planned, targeted murder intended to cause shock, attention and intimidation.”

Mangione’s New York attorney Friedman Agnifilo is a former chief deputy prosecutor in the Manhattan District Attorney’s Office. She is married to Marc Agnifilo, who is Sean “Diddy” Combs’ attorney in his federal sex trafficking case.

What happens next?

Mangione is extradited to New York.

Once he arrives in a New York state court, his fingerprints and photographs will be taken, and since he has already been indicted, he will be charged with first-degree murder.

“I don’t think the judge will release him on bail or supervised release for any reason, considering his family has money (and) he has already fled the city and the state after being accused of a crime “To commit,” said Sarni.

How we got here

During a news conference announcing the charges against Mangione on Tuesday, Bragg said Mangione arrived in New York City by bus on Nov. 24 and stayed at a hostel on the island under the name “Mark Rosario” and a fake New Jersey ID Checked in Upper West Side. On the morning of Dec. 4, Bragg said Mangione left the hostel around 5:30 a.m. ET and drove to midtown Manhattan near the Hilton Hotel. When Thompson showed up, Bragg claims Mangione “then pulled out a 3D printed 9mm ghost gun fitted with a 3D printed silencer and shot him once in the back and once in the leg.”

According to authorities, Mangione was then found on December 9 at a McDonald’s in Altoona, Pennsylvania, with the same fake New Jersey ID and the 3D printed ghost gun.

Read more: What we know about Luigi Mangione, a 26-year-old charged with murder in the killing of the UnitedHealthcare CEO