Did Murderer of Idaho College Students Know Them?

Experienced crime experts are weighing in on the murder of four University of Idaho students. Dr. Casey Jordan suggests the killer was gradually building up to committing the monstrous deed. Professors Lawrence Kobelinsly and Alfred Titus from John Jay College of Criminal Justice believe it's likely the killer knew his victims. Also, Dr. Jordan and Agent O'Connell say they do not discount it's a serial killer.