Women have been killed by at least 15 serving or former police officers in the UK since 2009, new figures show.
The majority of women killed by former officers were their partners, according to feminicide census data first reported by The Times.
Other cases shown in the data, which track murders of women by men in the UK, were murder for financial gain and one where a former police officer suffocated his mother.
The murder of Sarah Everard by Wayne Couzens, who was a Metropolitan Police officer, had sparked renewed interest in attacks on women involving police.
Vigils held at Clapham Common in south-west London after her death on March 3 were interrupted by police, who controversially arrested women and dispersed mourners.
Couzens, 48, a diplomatic protection officer who carried a gun, has admitted to the murder of Everard, 33, and will be sentenced to the Old Bailey this week. He was fired by the Met after his admission of guilt.
He had also admitted to kidnapping and raping in an incident in which he drove the London marketing director to where his body was eventually found, in a forest near Ashford in Kent.
Speaking after Couzens admitted the offenses, Met Commissioner Cressida Dick said: “I have 44,000 people who work at the Met. Unfortunately, some of them are abused at home, for example, and unfortunately on occasion I have a bad mood.
Karen Ingala Smith, co-founder of the Femicide Census, told The Times the problem was “way deeper” than what one might describe as a “bad ‘one.” One example she cited was the scandal of undercover operatives having sex with activists they were targeting.
This month, a serving Met officer was charged with voyeurism offenses.
Ingala Smith criticized “disbelieving attitudes that empower rapists rather than support rape victims.” She said: “This is not the problem of a few ‘bad’ ones but of systemic and institutional sexism. The census of feminicides has shown that even the murder of a woman was not one-off.
Census data, which included Couzens, showed 10 murders by police officers, former police officers and a former special constable since 2009.
Other cases were classified as manslaughter and included Dorset Constable Timothy Brehmer, who strangled a woman he had had an affair with after she exposed him to his wife. Brehmer was cleared of the murder.
In most cases, which typically involved former agents, the women had been intimate partners, former intimate partners, or the abuser’s spouse.
Cases include Ivan Escak, who was jailed for life in 2013 for murdering his ex-wife by stabbing her 11 times in his hair salon in Ashford, Kent.
William Kean, a former Tayside Police Special Constable, was convicted in 2012 of beating an 80-year-old charity volunteer to death to steal money.
In 2011, former detective Peter Foster murdered her partner, a police officer, by hitting her with a baseball bat and stabbing her in the throat.