Bryan Kohberger pleads guilty in the Idaho student murders case, avoiding the death penalty. Key evidence, including DNA and surveillance footage, revealed during the court hearing.

For 30 months, Bryan Kohberger and his defense attorneys insisted on his innocence in the fatal stabbings of four University of Idaho students in their off-campus home.

Kohberger had purchased a military-style knife, a sheath and a knife sharpener on Amazon in the months before the killings, prosecution filings show.