so then how is laura rideout moving to north carolina? t is a good question. >> robin was suspicious of laura from the moment she arrived at her brothers town house. remember, the day craig went missing, laura was there. and, she was inside, tightening up. >> when i get in and i opened the sun glass door, it's laura. standing in his kitchen. >> that is -- that would be odd? >> it was odd. >> in my head, i'm thinking what are you doing here. >> cleaning up a crime scene, that is what investigated bolton suspected. in fact the boys admitted that it was their mother who gave them the bags of bloody clothes. >> it was just like something my mom told me -- >> when did your mom tell you to do that? >> it was this morning. >> okay? >> did you give you the bag? >> yeah. >> hours after arresting to two sons, investigator bolton headed to the home that laura shared with us pj. >> i was stunned. i was absolutely stunned. >> security video from days before craig right outs murder leads to a sickening revelation. coming up. >> diabolical plans forming