On the evening of August 26, 2009, 19-year-old Virginia Tech students David Metzler and his girlfriend Heidi Childs drove to Caldwell Fields in Jefferson National Forest, Montgomery County, Virginia. Sometime between 8:25 p.m. and 10:00 p.m. both were shot and killed in the parking area; David was found inside his 1992 Toyota Camry, shot through the driver’s side window, and Heidi was found on the ground nearby. The murder weapon was determined to be a 30/30 caliber rifle.

David, an engineering major, had brought his guitar, which remained in the car. Several of Heidi’s personal items were missing, including her purse, cell phone, camera, and her Virginia Tech ID on a lanyard, a detail that led investigators to consider robbery as a possible motive. Authorities say DNA was collected and persons of interest have been identified, but no arrests have been announced. A reward for information leading to an arrest and conviction has reached $100,000.

What details about that night or the people who knew David and Heidi might help move this case forward?