Investigators believe that it's "highly likely" that someone saw the killer's vehicle on Craig Creek Road on the night of the killings, Aug. 26, 2009. Childs and Metzler arrived at Caldwell Fields at 8:25 p.m., and were killed between 8:25 p.m. and 10 p.m.
"We encourage the public to continue working with law enforcement to help us solve these brutal murders and bring just to David and Heidi's killer," Whitt said.
Investigators have identified several vehicles that were traveling on Craig Creek Road on the night of the murders. Whitt said they are still looking to identify more vehicles, and that owners of the vehicles are not necessarily suspects. Here is the list of vehicles investigators are seeking more information for:
1. Green Sedan (Possibly a Taurus or Intrepid) stopping in front of residences on Craig Creek Road around 6 p.m.
2. A dark Blue Dodge Caravan seen parked at the Montgomery County/Craig County line near a logging site around 8:30 p.m.
3. A dark colored, older model van or minivan parked at Caldwell Fields after dark.
4. A dark colored Ford Crown Victoria or Chevrolet Caprice seen driving Craig Creek Road around 10 p.m.
5. A red or red/white Dodge pick-up with dual exhaust and oversized tires, tinted windows, extended cab, driving up Lee Road approximately 11:00 p.m. that night. Lee Road is directly across the street from Caldwell Fields.
6. A gray or cream colored Pontiac Bonneville early 2000 model, parked near Caldwell Field around midnight.
Whitt also said that they have "been overwhelmed" by the number of people who visit the Caldwell Fields area that have volunteered DNA samples. The Task Force assigned to the case is now in the process of comparing residents' DNA to the killer's.
Whitt did not take any questions from reporters following the statement he made directly to the killer.
The reward for information in this case is now up to $70,000.
To see more photos of Heidi Childs and David Metzler, click here.
Thursday we'll find out more about an unsolved murder case.
It's about the deaths of a teenage couple from Virginia Tech, Heidi Childs and David Metzler.
WDBJ7 will be live streaming a news conference at 2 p.m. Thursday. More details about the case are expected to be released during the news conference.
Childs and Metzler were shot and killed more than two years ago.
Four issues, all still very important to this murder investigation will be released today: the type of murder weapon, stolen items, vehicles of interest and physical evidence.
The Montogomery County Sheriff says he has a statement to make not only to the public but to the murderer.
David Metzler and Heidi Childs were getting ready to start their sophmore year at Virginia Tech.
The couple drove out to the Caldwell Fields area of the Jefferson National Forest.
Friends say to talk and play guitar, but the two teenagers would never be seen again.
Their bodies were found shot to death in the parking area by a man walking his dog.
The media release will be held in the Montgomery County Government Center in Christiansburg.
It'll happen in the Board of Supervisor's Meeting Room on the second floor.
There will be no questions following Sheriff Whitt's statement.