A paediatric doctor posted a final haunting image of schoolchildren peacefully listening to her talk an hour before a shooter gunned down three nine-year-olds and three members of staff.Missionary Britney Grayson visited The Covenant School in Nashville on Monday morning, leaving after talking about their life in Kenya at 10.12amLess than 20 minutes later , 28, shot her way into the private Christian school and killed six before being gunned down by police.
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