But Mr Mangione’s lawyer, Thomas Dickey, has said he plans to fight the extradition and maintains he has not seen evidence that link Mr Mangione’s gun with the crime.
“A lot of guns look the same,” he said earlier this week on ABC News.
On Wednesday, however, police found a positive match between Mr Mangione’s fingerprints and those discovered at the scene of the crime, NYPD Commissioner Jessica Tisch said.
Investigators are also looking at how Mr Mangione travelled into and out of New York City. They initially believed that he had taken a bus out of the city, but they now suspect he may have taken the subway to Penn Station – where they suspect he may have caught a train to Pennsylvania.
While Mr Mangione awaits his fate in the New York court system, he remains in in his own cell under maximum security at Huntingdon State Correctional Institution in Huntingdon County, Pennsylvania.
He was denied bail at his hearing on Thursday.
His next court appearance is 30 December.