An investigation is underway into what caused a helicopter to crash into a Williamsburg townhouse Sunday evening, killing at least one person. Virginia State Police said the crashed happened at a home on Settlement Drive, off Ironbound Road, just before 5 p.m. State police identified a resident killed in the crash as 91-year-old Jean Lonchak Danylko. The Federal Aviation Administration said in a tweet the pilot was onboard the R44 helicopter when it crashed. Officials with the National Transportation Safety Board returned to the scene Monday morning as the investigation continued. State troopers are working with officials to locate and identify the pilot of the aircraft.