COMING UP: Don't miss Xfinity Monday Live, with special guest Broncos Tight End A.J. Derby. Watch it on CBS4 at 6:30 p.m. or head to ViewHouse Centennial to see it live!
Columbine Father Created 'Rachel's Challenge' For Safer SchoolsThe father of one of the students killed at Columbine is working to prevent school violence in his daughter's memory. He also has some advice for the people living in Newtown, Conn.

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