shelly nance who always steered clear of trouble, was stabbed to death in her own bedroom. detectives believe the killer was somebody she knew. possibly her roommate. after all, it was ashly who found her. now, they were about to bring the young woman in for questioning. and would confront her with a potentially important piece of evidence. i kept thinking i was asleep, it was a really bad dream. and this wasn't really happening. i couldn't imagine anything like that ever happening. >> definitely a shock. >> reporter: the first stage was denial. that shelley nance, their innocent wisp of a sister, had been murdered, was almost beyond comprehending. but maybe worse, quite possibly they weren't going to know who did it. the first and most obvious mystery jumped right out at the experienced eyes that cased her bloody bedroom. shelley had been dead a while. >> we could tell by lookin' at