Shante Johnson was in seventh grade when she began leaving notes from a secret admirer in the locker of her husband-to-be. “Derek and I are soulmates,” she said tearfully Monday night, one year after Draper Sgt. Derek Johnson was gunned down at the end of a graveyard shift. “I don’t think many 12-year-olds make it to the altar of eternity and stay that way.” After a year of somber, heartbreaking services, Monday’s memorial brought both laughter and tears to the 200 friends, relatives, colleagu...