The focus of our next 'Montana Murder Mystery dates back 45 years. And today, it is Yellowstone County's oldest unsolved cold case. Saturday, February 5, 19-77, emergency dispatchers received a frantic phone call from the owner of a local helicopter company. He told dispatchers that a couple alerted him that while out walking on Jellison Road near the city of Billings' landfill, they found a woman's cold, lifeless, dead body. The victim? 21-year-old Ruth Lori Ballew, who was known to be a local prostitute of Billings. Almost five decades later, despite a man who admitted to taking money from her and a "confession" from another man, this murder continues to unnerve investigators.