New documents detail strange occurrences at the house where four Idaho college students were killed and what a friend of Bryan Kohberger told police.

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.

As Bryan Kohberger is beginning his life at an Idaho maximum security prison, lead prosecutor Bill Thompson is speaking out about the case and the controversial deal that spared Kohberger from the death penalty.

Former U.S. Attorney Josh Hurwit speaks about joining the prosecution team in the Bryan Kohberger case, the last-minute plea deal, and the emotional toll of sentencing day.

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

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.