Stuart Worby, 40, crushed a tablet of mifepristone into the drink on the night of August 3, 2022.
He then inserted several tablets of another abortion drug – misoprostol – inside the victim while she was blindfolded under the guise of ‘kinky sex’.
The woman had a severe physical reaction within a few hours and was admitted to the Norfolk and Norwich University Hospital the following day where she lost her baby at 15 weeks.
She initially had no suspicions around the miscarriage, but later reported Worby to the police after finding messages on his phone to another man – Wayne Finney – saying ‘it’s working’ and ‘there is lots of blood’.
It was at that moment that she realised what she had suffered was not a spontaneous miscarriage but a ‘deceitful and planned termination’, Norfolk Police said.
Worby, of Dereham, Norfolk, was found guilty of administering poison or using an instrument with intent to procure a miscarriage following a trial at Norwich Crown Court.
The defendant, who had denied the charges, was also found guilty of assault by penetration.
Nueza Cepeda, 39, of Dereham, pleaded guilty to supplying an instrument to procure a miscarriage.
Worby’s bank statement showed he paid for Cepeda to have a medical consultation that resulted in her obtaining the two drugs, the CPS said.
Norfolk Police said the trial heard that Worby had bought the tablets for £470 from a gynaecology centre in London on July 29, 2022.
Cepeda had made a telephone appointment to the centre to say she was pregnant, already had a family, and wanted to terminate the foetus.
The centre explained it was a criminal offence to give the medication to someone else and Cepeda was given the prescription.
Her boyfriend, Wayne Finney, 41, of Swaffham, was found not guilty of intentionally encouraging or assisting others commit a crime.
Nicola Pope, of the Crown Prosecution Service, said: ‘This is a heartbreaking case involving a woman who wanted to have her baby but was forced to have a miscarriage by Stuart Worby.
‘He committed this heinous crime along with Nueza Cepeda, who helped him by illegally obtaining drugs that are used by women seeking an abortion.
‘These drugs give women power and control over their bodies – but the victim was forced to take them without her knowledge or consent.
‘I thank the jury who have had to listen to some disturbing evidence, our thoughts remain with the victim of this horrific crime.’
CCTV footage from the day before the incident showed Cepeda arriving at a pub with a white envelope containing what prosecutors said were the abortion pills and handing it over to Worby.
A gynaecologist gave evidence that simply ingesting mifepristone in the orange juice would not explain the woman’s symptoms or cause the spontaneous miscarriage by itself.
She would have had to have ingested misoprostol as well.
A toxicologist explained to the court that police took nail clippings from Worby for forensic testing.
The clippings were found to have traces of mifepristone and misoprostol on them.
A post-mortem examination, including an analysis of chemicals in the baby’s system, found traces of mifepristone.
DCI Duncan Woodhams said: ‘We pay tribute to the bravery of the victim who has endured the most terrible loss, her courage to come forward and give evidence has been invaluable in ensuring a guilty verdict.
‘We also pay tribute to all the medical and health professionals and family, neighbours and friends who have supported the victim in her testimony.
‘The impact of this event could have lifelong repercussions for the victim.
‘This has been a complex investigation into the deceitful and determined actions of Worby which had such horrific consequences and marks the first of its kind in finding someone guilty of this specific crime.’
Worby and Cepeda will be sentenced at Norfolk Crown Court on December 6.
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