Clarksville NowDavid N. Moore CLARKSVILLE, TN (CLARKSVILLE NOW) – “Every morning for seven years, he would come into the gas station to see me,” Crystal Sheffield said over the phone as she rewatched security camera footage of her conversations with David Moore. “Seven years of telling me stories and jokes,” she continued. “He was just so important in my life and I’m devastated. I’m so devastated.” The previous weekend, Moore had been strangled at the Salvation Army emergency shelter. A suspect was arrested, and the case is working its way through the court system. Sheffield was in disbelief as to why anyone would kill her friend.