>> they know him as joe benson. >> but amelia said her children didn't like joe benson. she says they found the fiction of their lives painful. to outsiders, it all appeared perfectly normal. amelia got a job as a seamstress and joe did odd jobs around town. in his spare time, he volunteered at the local high school, helping students build stage sets for the drama club. and we might never have known this story, the perfect crime complete. but the man the marines hadn't stopped now couldn't stop himself. >> when we come back -- >> we had a couple of girls come up to the police department, contact me and they that they believed there was some sexual abuse going on with joe benson and some other victims. i think he thought he was uncatchable. >> but then he started the old behavior again. >> couldn't stop. i truly believe that he couldn't stop. [ snoring ] [ thunder crashes ] [ snoring ] [ male announcer ] vicks nyquil cold and flu. the nighttime, sniffling, sneezing, coughing, aching, fever, best sleep you ever got with a cold... medicine. ♪ ♪ [ male announcer ] vicks dayqu