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1) The ‘Rejected’ stalker
 80%  of victims know their stalker and the most common is the ‘ex-intimate - 
rejected’  stalker. These perpetrators have been in a previous relationship –  usually controlling and abusive in nature – with the victim. On  separation they either want to reconcile, exact revenge - or a  fluctuating mixture of both. 
 Threats such as ‘if I can’t have you no-one will’ may be made prior to  assaultive behaviours. The 'rejected' stalking cases are more likely to  escalate to violence and research shows that one in two who make a  threat, will act on it.
2) The ‘Love Obsessional’ stalker
 These stalkers are also  relatively common and tend to be a casual acquaintance or isolated  ‘loner’. They desire a relationship with the victim and persist in their  quest despite, or oblivious to, the victim’s reactions.
3) The ‘Grudge’ stalker
 These stalkers are also  relatively common and can overlap with the ‘rejected’. They tend to have  a non-intimate relationship with the victim, for example a co-worker,  neighbour, or employer. They believe they have been a victim of an  injustice and are motivated by retribution.
4) The 'Erotomanic'
 This type of stalker is relatively rare, often mentally ill and believes the victim is in love with them. A challenge of managing these cases is the lack of motivation for  treatment. They do not see themselves as ill but blessed by a romantic  personality, although they convince themselves it is blighted by the  slow response of their target, or interference by others
   
5) The 'Predator' (Rapists) 
 They stalk in preparation for a  sexual assault, Information  gathering often occurs, too.
Note: Restraining orders are counterproductive for many stalking victims and  should not raise expectations of protection, or a resolution of  stalking.
http://www.telegraph.co.uk/women/lif...-mind-stalker/