According to family members who declined to be identified, the victims were Otis and Hazel Bush.
At press time, Lee County Sheriff Gary Parsons had released almost no official information on the case, but was expected to issue a statement sometime Tuesday night.
As of 2:30 Tuesday afternoon, the sheriff's office would confirm only that they were investigating a double homicide. Police were searching for a white 2001 Dodge pickup at the time, officials said.
Lee County sheriff's deputies converged on a small one-story house just off northbound U.S. 23, about four miles south of Big Stone Gap and roughly one-half mile across the Lee County border.
The house was surrounded by crime scene tape and sat close to two other houses along a one-lane road. Neighbors declined to comment and retreated to their homes as television and print news media arrived on the scene.
Lee County officials at the crime scene refused to comment on the investigation, and referred all questions to Parsons, who was not there at the time.
Later, investigators from the Wise County sheriff's office and the Big Stone Gap police department arrived, conferred briefly with their Lee County counterparts, then left, also refusing to comment on the situation.
Shortly after 5 p.m., police radio traffic indicated that officers had spotted the white pickup on Route 612 in Lee County, headed toward Route 70. A few minutes later, they reported that the suspect had been arrested.