people need to be murdered in order for the offender to be classed as a serial killer. The FBI stipulates three or more separate incidents whereas Dietz (1986) argues that a minimum of 5 victims constitutes a serial killer. Hickey (1991), Holmes and Holmes (1998), and Egger (1997) all define serial murder as the killing of three or more people over a period of time. Fox and Levine (1999 cited in Smith & Zahn) indicate that there needs to be 4 or more murders to be called a serial crime. For the purpose of this study a serial murder will be defined as a specific type of homicide involving the murder of two or more persons in separate incidents with an interval of time between the homicides. The interval can be several hours, days, weeks months or even years. The main point when defining a serial murder is that the series of murders do not share in the events surrounding one another Investigation of a Serial Crime Given the nature of serial murder there is a need for law enforcement agencies to approach this area differently to other forms of homicide. This type of crime creates much fear and panic within society and therefore it is crucial that prompt and well-coordinated measures be taken by law enforcement agencies to assist in the tracking of serial murderers. There are a number of significant problems in the investigation of serial killers. The most significant being linkage blindness that is the inability of