In Dearborn Heights outside Detroit, police find a killing field of strangled young women near the train tracks. Our experts weigh in as a massive manhunt leads detectives to a twisted killer with a taste for necrophilia.

In Chapel Hill, N.C., when troubled teen Josh Bailey goes missing, it leads detectives to a horrific gang-related homicide; experts zero in on how a psychotic, charismatic leader can manipulate others to the point of murder.