What is the story behind Cassie by Flyleaf?

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Tags

1. #school
2. #columbine
3. #gunshot
4. #cassie
5. #student
6. #single
7. #believed
8. #about
9. #killer
10. #bernall
11. #massacre
12. #reported
13. #killed
14. #there
15. #answered
16. #asked
17. #occurred