An arrest is made in the murders of four University of Idaho students.

Fourty-eight days after the brutal stabbing, Bryan Kohberger, 28, was arrested early Friday morning over 2,500 miles away in Pennsylvania. Kohberger has been charged with first-degree murder and felony burglary. An extradition hearing is scheduled for Tuesday. 

Police answered few questions about what led up to Kohberger’s arrest, saying Idaho law requires the arrest affidavit be sealed until the suspect is “physically back in Latah County” and officially charged.  

In the meantime, Kohberger's academics are being picked apart. Kohberger graduated from Northampton Community College with an associate of arts degree in psychology.  He received a bachelor's degree and a master's degree in criminal justice from DeSales University. 

Kohberger had just completed his first semester as a Ph.D. student in the Department of Criminal Justice and Criminology at Washington State University. He is also a teaching assistant there. 

Joining Nancy Grace today: 

• Dale Carson - High-profile Attorney (Jacksonville), Former FBI Agent & Former Police Officer (Miami-Dade County); Author: "Arrest-Proof Yourself, 
• Joe Scott Morgan - Professor of Forensics: Jacksonville State University; Author of "Blood Beneath My Feet" and Host: "Body Bags with Joseph Scott Morgan" 
• Sheryl McCollum - Forensic Expert, Founder: Cold Case Investigative Research Institute in Atlanta, GA; Twitter: @ColdCaseTips; Host of the new podcast, "Zone 7"
• Chris McDonough - Director At the Cold Case Foundation, Former Homicide Detective; Worked over 300 Homicides in his 25-year career; Host of YouTube channel, "The Interview Room"    

• Laura Ingle - Senior Correspondent, Fox News Channel, Twitter: @lauraingle, Instagram: @lauraingletv   

• Dave Mack – CrimeOnline Investigative Reporter