"Happy Face Killer" Keith Jesperson believes Kohberger's awkwardness and high-profile murder case make him vulnerable, and he's recommending a transfer to Oregon.

ABC News sat down with Idaho State Police Lt. Darren Gilbertson, the lead detective in the Idaho murders case, after Bryan Kohberger was put behind bars for life.

In the days after murdering four University of Idaho students in an off-campus home, Bryan Kohberger’s behavior shifted dramatically and investigators would later find that he had fixated on news coverage of the killings and began paying for items in cash – often wearing gloves – as he avoided the area of the murders.

Despite Kohberger's guilty plea in the Idaho murders, investigators still don't know his motive, who he targeted or where the murder weapon is after he covered his tracks.

Bryan Kohberger waved red flags to a former match on Tinder by questioning her about murder weapons and death in the weeks that led up to the gruesome slayings of four college students. A woman only referred to as “KC” and “C” in newly-released documents obtained by E!

Bryan Kohberger was sentenced to life in prison for killing Madison Mogen, Kaylee Goncalves, Xana Kernodle and Ethan Chapin. But will we ever know why?

Idaho quadruple murderer Bryan Kohberger transitions from county jail to maximum security prison where inmates with life sentences have nothing to lose

The legal saga against the man who murdered four University of Idaho students may have ended Wednesday, when he was sentenced to life in prison without parole. But new details about the case are still emerging,