Hence it is clear that more room should be made for literature on serial murder in the professional journals from a multidisciplinary approach. Types of Serial Killer It is important when studying serial crime that we gain some insight into the differing classifications offered. Serial murder is divided into a number of different typologies. The FBI classifies serial killers into two separate types. The disorganised killer and the organised killer. The disorganised killer is one that is psychotic, having lost touch with reality. They often believe that "voices" have instructed them to kill. The organised killer is a psychopathic offender. They have no conscious, they recognize right from wrong and understand the pain of their actions but this does not affect them from continuing their plight. In this scheme laid out by the Behavioural Science unit of the FBI (1985), killers are classed as disorganised when the offender is likely to leave evidence and weapons at a scene, try to depersonalise the victim and not use a vehicle. The organised killer tend to be far more violent than their counterparts, is likely to use restraints (to gain power and control over their victim), commit sexual acts with live victims and most likely uses a vehicle. The problem with the FBI's two classifications is that there is no room for a mix between the two types and often serial killers do not snuggly fit into either one category or the other. Holmes and Holmes (1996) classify serial killers into very different