. >> reporter: and mollie's unusually large posse of friends. 18-year-old kristene chapa. >> i talked about her a lot. >> reporter: kristene lived in a neighboring town where she was earning the reputation as a softball superstar. >> kristene was a softball. she was like the comic relief in our little group of friends. >> reporter: britney said wristene's sense of humor was a perfect match for mollie's. >> kristene brought out mollie's funny side. there was never a dull moment. >> reporter: for these girls, crazy and dull were relative terms. >> we were not the party kids. we never drank or anything like that. we would go to taco bell. we would go to coffee shops and we would go to parks. >> reporter: which is exactly what mollie and kristene decided to do on a warm summer night back in june 20 elf. their destination andrews park. >> was it safe to you? >> yeah, it did. all of the parks. >> we would go at night all the time. >> reporter: before heading out, the two called britney asking if she wanted to join them. >> they asked me to go, but i had a volleyball game the next morning so