Ann Kline (8 of Hearts, Indiana)

Ann Kline, a loving daughter, wife and teacher, was grading papers in the middle of the afternoon in January 1973 when someone stabbed her repeatedly in the hallway outside her Evansville, Indiana classroom, and left her to die. Detectives have worked for 50 years trying to solve her murder, and today they’re working a lead that could actually close the case for good.