Idaho Murders

Why Bryan Kohberger Left a Witness Alive in Idaho Murders: Prosecutor Shares Theory

Key Takeaways:

  • Bryan Kohberger likely saw surviving roommate Dylan Mortensen but chose to flee out of fear or panic.
  • Mortensen continues to suffer psychological effects and gave a powerful victim impact statement in court.
  • Kohberger’s plea deal spared him the death penalty but resulted in life without parole for the University of Idaho murders.

After receiving four consecutive life sentences for the brutal 2022 stabbing deaths of four University of Idaho students, Bryan Kohberger’s motive—and his decision to spare a key witness—remains under scrutiny.

Dylan Mortensen’s Account Raises Chilling Questions

Among the most haunting aspects of the case is why Dylan Mortensen, a surviving roommate, was left unharmed. Mortensen told police she saw a masked man leaving the house shortly after hearing strange noises. Prosecutor Bill Thompson suggested the killer likely saw her too.

“From what Dylan described,” Thompson told the Idaho Statesman, “I have a hard time imagining that the killer did not see Dylan.” Investigators now believe Kohberger may have fled out of panic, having overstayed his plan and unsure if police were already on the way.

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Survivor’s Testimony Highlights Lingering Trauma

During the July 23 sentencing hearing, Mortensen shared how the encounter altered her life. “I couldn’t be alone. I had to sleep in my mom’s bed because I was too terrified,” she said. She continues to suffer from frequent panic attacks and hypervigilance, revealing how the trauma haunts her daily.

Her emotional courtroom statement offered a rare, intimate view into the psychological aftermath faced by the surviving roommates.

Kohberger’s Plea Deal Averts Death Penalty

Originally facing the death penalty, Kohberger accepted a plea deal on July 2, 2025, pleading guilty to four counts of murder and one count of burglary. In doing so, he waived the right to appeal or seek a reduced sentence.

Though the victims’ families expressed frustration over the plea agreement, Judge Steven Hippler sentenced Kohberger to life without parole for each murder charge, plus significant fines.

Why He May Have Left Without Killing Everyone

Prosecutors now theorize that Kohberger’s departure was unplanned. Thompson noted, “It wouldn’t surprise us that the killer was scared at that point and decided they had to leave.” Kohberger may have viewed Mortensen as too risky to confront after already committing four murders.

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