When a married mother of two seems to run off with her secret boyfriend, it feels like a family tragedy. But the real tragedy might be even darker as Detective Rosie Rodriguez investigates Kathy Lujan’s disappearance — and uncovers that some of the text messages she sent after she left don’t seem to match the way she usually talked. So who was sending the texts? And was there something more sinister going on? Oxygen’s hit show Snapped investigates the true crime mystery in their 400th episode, airing Sunday, Nov. 11 at 6 p.m. ET. Can’t wait until then? Check out our sneak peek into Kathy’s story. Watch the video above to see the exclusive clip, and don’t forget to subscribe to our YouTube Channel.