Community remembers Sam Knopp, the student killed at a university dorm in Colorado

Days after a devastating shooting at the University of Colorado Colorado Springs that took the lives of Samuel Knopp and Celie Montgomery, the school's community and friends of the dead are coping with the aftermath.

Monday was declared a day of healing at the university, as hundreds of students, staff, and community members took part in a walk to honor the victims. 

Those who knew Knopp recalled to "CBS Mornings" what happened when they heard about the shooting.