Karen Swanson Yee, 48, and Kim Bryan Yee, 56, were found dead of apparent gunshot wounds, Franklin County Sheriff's Department said.
"This case is being investigated as a murder-suicide, pending results from the medical examiner's office," Lt. Todd Maxey said in a news release.
Around 3 p.m. Tuesday, deputies found one male and one female occupant in a silver 2001 Jeep Cherokee parked on the side of Ramsey Memorial Road at the intersection of Snow Creek Road.
Both victims were confirmed dead at the scene from apparent gunshot wounds.
A handgun was found inside the vehicle.
The Yees, who were married in 1995, were the owners and operators of Penhook Boat Dock, on Jefferson Dock Road in Pittsylvania County.
Mrs. Yee was the daughter of Pittsylvania County Commissioner of Revenue Sam Swanson Jr.