Investigation Discovery digs deep into the psychological forces that drive a person to commit homicide. What compels him or her to decide that taking a life is something that must be done? Perhaps the offender has been struggling with lifelong issues. Or maybe it's an inability to cope with pressures of adulthood. Whatever the case, the perpetrator's tortuous journey stunningly ends in violence. Episodes include interviews that offer insight into the troubling relationships between offenders and victims. Law enforcement personnel and psychiatrists also provide context. And, of course, ID's typical re-creations bring to life complex backstories, the homicide scenes and the aftermaths of senseless crimes.