Kristen Modafferi , 18 , from Charlotte , San Francisco , disappeared in North Carolina without a trace in 1997 . Her sister Allison urges Robert Durst to be honest with police if he knows anything about what happened . The last sighting of Kristen was walking through the upscale mall with a blonde 'woman ' Speculation has risen in recent days that it was Durst , a known cross-dresser . Oakland Police have ruled out a link but the FBI has investigated the connection between Durst and Kristen 's disappearance . Parents Bob and Debbie Modafferi believe 'the ongoing interrogation of Durst ... could uncover new information '
Kristen Modafferi , 18 , from Charlotte , North Carolina , disappeared in San Francisco without a trace in 1997 . Her sister Allison urges Robert Durst to be honest with police if he knows anything about what happened . The last sighting of Kristen was walking through the upscale mall with a blonde 'woman ' Speculation has risen in recent days that it was Durst , a known cross-dresser . Oakland Police have ruled out a link but the FBI has investigated the connection between Durst and Kristen 's disappearance . Parents Bob and Debbie Modafferi believe 'the ongoing interrogation of Durst ... could uncover new information '