A recent study of crimes between current and former couples revealed that around 30,000 women around the world were killed by current or former husbands in 2017.

The British expert in criminology Jane Mankton Smith studied 372 murders in the United Kingdom, according to the agency "Spontik" Russian

Jane, a lecturer at the University of Gloucestershire, concluded that women account for 80 percent of victims of marital murders, most often a husband.

Jane said the men who killed their accomplices followed a certain pattern that police could use to prevent further killings.

The study is published in the journal Violence Against Women, in which Jane points out that this pattern consists of eight phases that a man goes through before he kills his partner.

In her study, Jane investigated all recorded cases in which a woman victim had a prenuptial relationship with the perpetrator, as well as a number of cases in which male victims were also killed by their male partners.

"We have always relied on factors such as emotion and spontaneity in the search for the causes of murder - and that approach has not been sound," she said.

Jane told the BBC that once they realized the eight stages, police would be able to trace potential perpetrators, and victims would be better able to clarify their positions to specialists.

She pointed out that the police wanted to welcome the study "to an unforeseen degree, and began to apply it to the cases in their hands, because it reflects their experience and put points above the letters in the chaos of domestic violence, violations, coercive control and prosecutions."

The eight stages that Jane spoke about in her study are:

- A history of prosecutions or harassment prior to association.

- Accelerate the pace of romantic relationship and enter into a serious relationship.

- A tendency to behavioral control that controls the relationship.

- Start the march of control; through the threat of termination of the relationship or the announcement of financial default.

- Escalation; by intensifying control tactics, from pursuing or threatening suicide.

- Change in thinking; resort to another way is revenge or murder.

- planning; buying a weapon or improving opportunities for individual victimization.

- Carrying out the crime; killing the partner (or partner) and possibly injuring others as the victim's children.