Boise defense attorney Edwina Elcox says evidence of Idaho student murders suspect Bryan Kohberger’s purchase of a Ka-Bar knife is ‘terrible’ for his defense and could place his lawyers in an ‘insurmountable’ position. Boise defense attorney Edwina Elcox says evidence of Idaho student murders suspect Bryan Kohberger’s purchase of a Ka-Bar knife is ‘terrible’ for his defense and could place his lawyers in an ‘insurmountable’ position.