State police investigators believe the person who killed Morgan Harrington was very familiar with the farm where her body was found Jan. 26, Lt. Joe Rader said this afternoon.

Rader said the person "may have traveled, worked, recreated, visited or periodically passed through the farm or the nearby area."

Harrington, a 20-year-old Virginia Tech student from Roanoke county, disappeared Oct. 17 after leaving a Metallica concert at John Paul Jones Arena in Charlottesville. Her body was found in a field on Anchorage Farm in Albemarle County, about 10 miles south of where she was last seen.

At a news conference in Charlottesville this afternoon, Rader urged residents of the area in Albemarle County to call a new police tipline to discuss anything they may have seen or heard.

The new tipline is 434-709-1685.

Rader said profilers have concluded that the person that left Harrington's body there had to have been familiar with the territory, otherwise that person would not have negotiated so many obstacles, such as streams, fences and rough terrain.

"You could not have just walked in there without having to be able to negotiate things," Rader said. "You had to be familiar with the layout."