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'The eight steps she discovered in almost all of the 372 killings she studied were:
A pre-relationship history of stalking or abuse by the perpetrator
The romance developing quickly into a serious relationship
The relationship becoming dominated by coercive control
A trigger to threaten the perpetrator's control - for example, the relationship ends or the perpetrator gets into financial difficulty
Escalation - an increase in the intensity or frequency of the partner's control tactics, such as by stalking or threatening suicide
The perpetrator has a change in thinking - choosing to move on, either through revenge or by homicide
Planning - the perpetrator might buy weapons or seek opportunities to get the victim alone
Homicide - the perpetrator kills his or her partner, and possibly hurts others such as the victim's children
The only instance where a stage in the model was not followed was when men did not meet stage one - but this was normally because they had not had a relationship before, she said.'