Donna Lemon (7 of Spades, Idaho)

Donna Lemon was having a normal summer in 1973, working in Bozeman, Montana and hanging out with friends, until one day she never showed up to ride horses with one of her friends. Lemon, 20, was found stabbed to death on the banks of the Snake River in Idaho. After almost 50 years … detectives are still actively working this cold case.