police zero in on three fellow students. the dead girls friend. a small group of shelley s fellow students. had a budding artist designed a seemingly perfect murder? there was the boyfriend, fascinated with weapons. he had daggers. knives. swords. who collects that kind of stuff? reporter: there was the guy always hoping to get her attention. trying to corner her in the hallways at school. texting her on the phone. she s like, he s really weirding me out. reporter: but maybe the brutality of the crime pointed to the roommate. something like a lover would do. a spurned lover. absolutely. shelly nance was a shy girl. a budding artist who greatest pleasure was to sit in her room and draw. with thattal entd. she earned a scholarship to the art institute of dallas. she was thriving. then, the unthinkable happened. shelly was stabbed to death.