. >> reporter: ruth roberts says her daughter had a nearly picture perfect life. >> i was a single mom. i was working really late at night and i was making a six-figure salary, and, i mean, my daughter was getting as and bs. she didn't need anything. she didn't want anything. we had money. we had a good house, good life. >> reporter: but there was one thing her daughter did want. >> she was 15, just starting high school, her dad and i were divorced, and her dad got a girlfriend couple years older than my daughter, so -- my daughter became really jealous and wanted to be with him all the time. >> reporter: you told him, what, you said, if you're not around -- >> she's going to go find a father figure. >> reporter: she did. he turned out to be a pimp. >> reporter: she was walking the streets. he would put her in shoes that were too small. she had blisters this thick when i saw her a month later. he wouldn't let her come in unless she had money. he would leave her out freezing in the cold. he would make her have sex with all of his friends. >> reporter: and how old was she? >> 16. >> repo