Marjorie Sue Fithian (Wild Card, Colorado)

On the morning of June 24, 1975, Marjorie Fithian and her 18-month-old son were supposed to be taking a bus from Denver to Greeley, Colorado. However, just hours after Marjorie was seen waiting for the bus in Denver, she was found with her son alongside a dirt road in rural Colorado — she had been shot in the head. For nearly 50 years, detectives in Colorado have been trying to solve her murder. Theories surrounding her gruesome and mysterious death range from a possible serial killer to drug conspiracies, but no leads have ever panned out. This case is one that has haunted everyone who has worked on it over the years, and investigators are desperate to solve it.