A 17-year-old Prince George’s County honor student who aspired to attend Harvard University was killed in her bedroom after a gunman burst into her house, police said Thursday — a crime considered unthinkable to residents who remembered the girl for her ambition and intellect. The shooting occurred at about 10:15 p.m. Wednesday inside a split-level home on a quiet street of single-family houses in the Kettering neighborhood. Detectives are investigating a report that the gunman came through the front door, made his way into the house in the 100 block of Chartsey Street and shot Amber Deanna Stanley. Other family...