January 2, 1956Great Falls, MontanaPatricia Kalitzke (16) and Lloyd Bogle (18) are killed; their murders remain unsolved Kalitzke and Bogle were last seen leaving a drive-in around 9 p.m. on January 2. When they failed to return home that evening, Kalitzke’s parents assumed the pair had eloped. The next day, however, three young boys found…