detectives called knox county chief deputy attorney hal johnston down to erika's apartment.agreed this has got to be the same guy. we don't know. but those-- those very strong correlations there, both of the victims were young college students. they were white females. they lived off campus. the couch cushion in the tub indicated to me something had happened on that couch that the perpetrator wanted to clean up. there's been some type of an assault here. and they're desperate enough to have moved the body. andrea canning (voiceover): erika's family lived over 100 miles away and got a call from investigators that no one wants to get. erika's mother, elaine. andrea canning: what did they say? that she was missing. and i was like, how could she be missing? i couldn't understand it. you know, what are you talking about? andrea canning (voiceover): erika's sister, ronda, made the long, agonizing trip to vincennes with her parents. ronda norman: and it seemed like an impossible feat that she's missing. and now we have to find her. andrea canning (voiceover): detectives didn't shar