(NewsNation) — Families and friends of the four University of Idaho victims delivered emotional tributes as hundreds gathered at a campus vigil.

A total of 40 days have passed since the killing of the victims, and a suspect has not been named. 

If you have information that could be helpful for law enforcement, you can contact them at their tip Line: 208-883-7180, email tipline@ci.moscow.id.us, or go online to fbi.gov/moscowidaho.