(NewsNation) — NewsNation has exclusively learned that Idaho killing suspect Bryan Kohberger was allegedly fired from his position as a teaching assistant at Washington State University.

Scott Bonn, an author and serial killer expert, weiged in on what he believes could have led Kohberger, a suspect in the murder of four Idaho college students, to kill.

“He (Kohberger) reached a tipping point where he simply couldn’t take it anymore, and he had to act out on his fantasy of killing,” Bonn said Tuesday night on “Banfield.”

Watch Bonn’s full analysis in the video player above.