. >>> 19-year-old devon guzman left her apartment one night and never returned home. the next morning her roommate, keary renner, and a friend drove all around easton, pennsylvania, looking for her. eventually, the girls found devon's brand-new car in a deserted lot. >> when i saw her -- devon's, you know, lips and eyebrows were purple. and i don't know why i didn't think she was not dead. because nobody really expects that. and i shook her and she didn't answer. i was screaming. i was hysterical. >> devon guzman was pronounced dead at the scene. >> she had sustained a severe laceration in the throat area. >> an empty syringe was found in devon's waistband, although toxicology tests showed no drugs in devon's system. and in devon's hand was a knife. there was no blood on it, and experts concluded from its size that it was not the murder weapon. >> it was an unsophisticated attempt to lead police in the wrong direction or to perhaps somehow we would conclude that it wasn't a murder. >> the lack of blood at the scene, along with grass and dirt stains on the victim's pant

. >>> 19-year-old devon guzman neft her apartment one night and