The suspect arrested in connection to the murders of four Idaho college students was nabbed at least in part thanks to “genealogical DNA” evidence, sources told Fox News’ Judge Jeanine Pirro.

“[M]y sources are telling me that there is genealogical DNA that was established in this case that led the police to this particular suspect,” Pirro said on “The Five” Friday.

“So although that was, according to my sources who are very credible and reliable, …. if you try murder cases and especially murder cases that involve several victims, you understand that really the investigation begins now.”

Pirro recounted how Idaho authorities said during an afternoon press conference Friday that suspect Bryan Kohberger’s probable cause affidavit will be unsealed after he is successfully extradited from Pennsylvania – where he was captured – to Idaho.

CRIMINOLOGY GRAD STUDENT HIT WITH FOUR COUNTS OF FIRST DEGREE MURDER: POLICE

Kohberger was arrested early Friday in a private community near the Pocono Mountains village of Jonas, Pa. He was arraigned before a Monroe County judge and remains in custody.

The suspect was a PhD student in criminal justice/criminology at Washington State University – not far from the University…