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In 1999, thirteen people were killed and twenty four injured at the Columbine high school shooting. For seventeen years, the parents of the killers have kept their silence. Now, Sue Klebold, the mother of Dylan Klebold, has written a book, "A Mother's Reckoning: Living in the Aftermath of the Columbine Tragedy". All of her proceeds will be donated to research and charitable foundations focusing on mental health issues. She spoke to Â鶹Éç Newsnight's Kirsty Wark.