Investigators are examining whether Walter "Leo" Jackson, Sr., who died in 2018, committed other previously unsolved crimes.

The man had never surfaced as a suspect in a nearly 30-year investigation of two murders at a secluded campsite in Shenandoah National Park in Virginia.

The killer identified as responsible for murdering two women in Shenandoah National Park, Virginia died in prison in 2018, the FBI said.