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Twelve students and a teacher, William 'Dave' Sanders, were killed and 24 were injured at a mass shooting at Columbine High School in 1999 . His daughter, Coni Sanders, recounts his last moments, and explains how she has begun a dialogue with Sue Klebold, the mother of Dylan Klebold - one of the two teenagers who carried out the shootings. Image: Coni Sanders, next to the memorial to those who died at Columbine High School, Littleton, Colorado. Credit: ÃÛÑ¿´«Ã½