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A murder mystery fan who beat her love rival to death was caught after her DNA was found under the victim’s fingernails when she scratched her killer’s face in a brave final act.
Sara McKenzie, 61, constructed an elaborate cover-up to explain the presence of her DNA, claiming to have been the victim of a robbery earlier that same day, during which the female suspect had scratched her and grabbed a handful of her hair.
McKenzie told police that she thought the woman had been after her DNA and tried to suggest that the same woman had also attacked Joy Boulton, 59 – the woman she killed in a jealous rage.
Guildford Crown Court heard how McKenzie had previously been in a long-term relationship with Ms Boulton’s fiancé, Trevor Dibnah, in Ash, Surrey.
McKenzie had made efforts to rekindle their relationship and accused Mr Dibnah of breaking her heart, but he told her that he was not going to leave Ms Boulton.
Joy Boulton (pictured) was beaten to death by a love rival who accused her of stealing her fiancee
![McKenzie, of Fairview Road, Ash, Surrey, broke down in tears as she was found guilty of murder and perverting the course of justice after a five-week trial](https://i.dailymail.co.uk/1s/2023/12/01/08/78460401-12813233-image-a-15_1701421154300.jpg)
McKenzie, of Fairview Road, Ash, Surrey, broke down in tears as she was found guilty of murder and perverting the course of justice after a five-week trial
![Guildford Crown Court heard how McKenzie had previously been in a long-term relationship with Ms Boulton's fiancé, Trevor Dibnah (pictured), in Ash, Surrey](https://i.dailymail.co.uk/1s/2023/12/01/09/78461883-12813233-image-a-17_1701422471918.jpg)
Guildford Crown Court heard how McKenzie had previously been in a long-term relationship with Ms Boulton’s fiancé, Trevor Dibnah (pictured), in Ash, Surrey
Unable to cope, McKenzie went to the victim’s house with the sole intention of killing her, striking her multiple times in a sustained and ferocious attack with a heavy object which left her with catastrophic head injuries which were to prove fatal.
Ms Boulton’s final brave act was to scratch her killer’s face, which proved critical in proving McKenzie was responsible after her DNA was discovered under the victim’s fingernails.
After attacking her rival, McKenzie tried to conceal her crime, disposing of the clothing she had worn and the weapon used.
She also had a bath to remove any trace of blood and cleaned it up afterwards.
Forensic scientists were able to locate traces of Ms Boulton’s blood in McKenzie’s bath using luminol, a substance that can identify a trace of blood that has been diluted 10,000 times.
McKenzie showed absolutely no remorse, went to work as normal, even visiting the petrol station to fill up her car.
She was later captured on police body-worn footage at the scene of the murder chatting with no apparent concern for the victim.
McKenzie, of Fairview Road, Ash, Surrey, broke down in tears as she was found guilty of murder and perverting the course of justice after a five-week trial.
![Ms Boulton's (pictured) final brave act was to scratch her killer's face, which proved critical in proving McKenzie was responsible after her DNA was discovered under the victim's fingernails](https://i.dailymail.co.uk/1s/2023/12/01/08/78460403-12813233-image-a-16_1701421178778.jpg)
Ms Boulton’s (pictured) final brave act was to scratch her killer’s face, which proved critical in proving McKenzie was responsible after her DNA was discovered under the victim’s fingernails
Detective Chief Inspector Kimball Edey from the Surrey and Sussex Police Major Crime Team, who investigated the case, said: ‘Firstly, I would like to offer my condolences to the family and friends of Joy Boulton whose loss cannot be underestimated. They have been left devastated by Joy’s death.
‘McKenzie’s motive for killing Joy was simple – she wanted what Joy had. McKenzie has a previous history of jealous behaviour including, although it was never proved, burning down a shed containing Trevor’s belongings after finding out he had got engaged to Joy.
‘McKenzie went to Joy’s that morning with the sole intention of killing her so that she could get Trevor back. The rage and brutality McKenzie used when she attacked Joy cannot be overstated –sadly, Joy never stood a chance.’
DCI Edey added: ‘I would like to thank my team who worked tirelessly on this investigation to ensure that McKenzie was found guilty today. This level of violence simply cannot be condoned in our local communities and we will always do everything we can to ensure those responsible are brought to justice.’
Paying tribute to Joy, her family said: ‘We are deeply devastated by this senseless act of violence which has changed our lives forever.
‘Joy was a very caring person, who was always ready to help other people whenever she could despite having many health and mobility problems herself. She fought many health problems over the years but always battled on.
They added: ‘She will be forever missed and always loved. May you rest in peace.’
Sara McKenzie will be sentenced at Guildford Crown Court on Monday.
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