>> when they came out, they were both crying. >> reporter: they told their mom creech threatened to kill gavin if he doesn't stay. though 17 months later he disappears, lisa had a bad feeling. >> everything changed right then for me. >> reporter: detectives were suspicious, too, remember, chandy told them she didn't see gavin that night. but there was evidence to the contrary. cell phone record showed gavin's phone and chandies were in the same place that night. a little triopening lakes narrowed down just where in. >> we came down this street and this was the likely spot. >> reporter: a likely spot for a tryst, that is? so it seemed on the night he disappeared he met chandrika creech for sex for cost or to talk.