Father of Kaylee Goncalves, one of four murdered University of Idaho students, says there is evidence his daughter fought back

The Nov. 13, 2022, murders of Kaylee Goncalves, Madison Mogen, Xana Kernodle and Ethan Chapin, students at the University of Idaho, left the nation stunned and the families of the victims searching for answers.  

Bryan Kohberger, charged in the case, faces four counts of first-degree murder and one count of burglary. A judge has entered a not guilty plea on his behalf. As attention turns to Kohberger's trial, the murders remain unexplainable, with questions lingering.

"I don't know why it happened," Jazzmin Kernodle, sister of Xana Kernodle, told "48 Hours" correspondent Peter Van Sant in her first interview. "I wish we knew. They were, all four of them were, just such great people and made such an impact on the lives around them."