For nearly three years now, authorities haven't been able to catch whoever killed Virginia Tech students David Metzler and Heidi Childs.
Thursday afternoon, they released new information they hope will lead to justice. Authorities said they now have DNA evidence in the case.
Metzler and Childs had been a couple for about four years. On the night of Aug. 26, 2009, they had arrived at the Jefferson National Forest after leaving Childs' apartment in Blacksburg.
They reportedly didn't plan to stay long, just talk and play guitars. But in a parking lot someone murdered them.
"The murder weapon has been determined to be a 30/30 rifle," says Sheriff Tommy Whitt of Montgomery County, Va.
Thursday, Whitt said it happened on a Wednesday night when a lot of folks in the area were going to prayer meeting at church.
"It's highly likely that someone observed the suspect on Craigs Creek Road that night," he says.
Other new information released Thursday: The sheriff believes the killer stole 18-year-old Childs' purse, along with a camera, credit card, phone, and Virginia Tech ID card.
The sheriff said he had a personal message for whoever would kill such an innocent young couple.
"We have DNA, we are aggressively and actively pursuing you," he says. "We will not rest until you are apprehended."