By Joe Beck Fifteen years after her 20-year-old daughter was stabbed to death and her 10-week-old granddaughter disappeared, the long, frustrating wait for answers to the crime continues for Angela Stover. Stover received the grim news of Sylena Jo Dalton's death from a sister who lived across the street and was the first family member to see the victim's body in the apartment at 175 S. Charles St. in Strasburg. All had seemed fine hours earlier when Stover left the infant Allyson and Dalton at the apartment where all three lived. Stover remembers being called away from work hours later and listening in horror as her sister described what had happened. "My sister told me that Sylena was stabbed to death, and they can't find Allyson," Stover said in an interview Friday. "Needless to say, I just fell to the floor and started crying for my mother." Allyson Dalton has not been found. Stover said police searched the Shenandoah River and some Dumpsters without success. Angela Stover and her mother, Bonnita Smith, say they know who killed Sylena Dalton and took Allyson. They blame the Virginia State Police for failing to make an arrest in the case. Stover said she was last in contact with the state police about three months ago and came away discouraged. She said the conversation followed a pattern that has become all too familiar to her over the years. "We're angry and upset," Stover said. "We don't feel they're working on the case. They don't contact me. I contact them." Sylena Dalton's killer remains at large and the fate of infant Allyson Dalton is unknown.