to be his sex slaves, there was this woman, teresa williams.1985, williams, who asked to us conceal her face, says she was a young sexually naive 20-year-old when she started dating john robinson. >> he seemed actually like quite the gentleman. pretty nice, pleasant. >> williams said she knew nothing about john robinson's life. but during their five-month relationship, teresa said she was held as robinson's virtual prisoner in this apartment complex, where robinson did unspeakable things to her. but one day in particular stands out. the day john robinson's personalty took a dramatic turn for the worse. >> he was just a different person when he walked in through the door. very demanding. he was very rushed. i made him mad enough that he assaulted me bad enough to -- he could have taken my life. and he hurt me, but i was lucky enough. he didn't kill me. and he could have, and he let me know that. >> days later the fbi showed up at her apartment, warning her that a woman with connections to john robinson vanished and advising to leave robinson imm