>> very seldom do you have an attack take place with a witness present. attackers in most sexual assaults don't want any other witnesses. z >> a rape test kit collected biological evidence and the results showed it was the same perpetrator in both cases. >> the next morning, investigators found the teenager's car just a few blocks from where vanessa was assaulted. >> we realized he didn't keep the car long. and that the point, we really started focusing in on that he did live in that area and that was his area of comfort where he was acting from just to give him an easy route to get home, wherever that was. >> unfortunately, police found no foreign fingerprints or other trace evidence inside the car. the very next night, two women were walking home from a nightclub around 2:00 a.m. when