The gay husband of a defeated High Court litigant - who lost a share of a £1.2m property - stalked and blackmailed a witness after launching an “abusive and derogatory” online campaign against the 52 year-old businessman, a jury heard.
Darren Cooper, 54, created a newspaper-style blog, which accused the tech industry CEO of drug dealing and sexual abuse, even including the man’s model/singer daughter and threatening to destroy her career, the trial was told.
Eventually he demanded sums of £250,000; £100,000 and £80,000 to close down the blog and delete abusive posts on twitter and LinkedIn, Inner London Crown Court heard.
Cooper, of Brayburne Avenue, Clapham has pleaded not guilty to blackmailing the businessman between January 14 and July 19, 2023.
He also denies stalking the entrepreneur and his daughter between January 1, 2021 and July 19, 2023.
Cooper’s husband, South Africa-born Thain Kleinhentz - an NHS health advisor - lost a High Court claim for a share of his ex’s Baron’s Court house in Margravine Gardens, which sold for £1.2m in 2015.
He claimed he was owed £250,000 after sharing the property for many years as the partner of the property’s owner Mark Harrison, but lost after a two-day trial.
The tech CEO gave evidence on behalf of Mr Harrison, resulting in Cooper creating a blog condemning his character and behaviour in the witness box.
“He repeatedly posted abusive and derogatory material online about them and demanded £80,000 and then larger sums of £100,000 and £250,000 to remove the material,” said prosecutor Jonathan Whitley.
“This is vengeful behaviour that arises from a civil court case in 2020 when Mr Kleinhentz said he was entitled to a share of the property owned by Mr Harrison.
“Mr Kleinhentz lost with an order for costs against him and he declared bankruptcy,” added Mr Whitley. “This defendant is his husband and believes he should have won the case and blames the complainant for losing.
“Cooper admits posting the material and sending emails to the family and company board members and says he was justified in doing that.”
The businessman told the jury the family took the decision to go to the authorities after receiving an email that referred to the “gang bang” of his daughter.
“She was a significant target. The language and implication was unacceptable and we decided it was time to take action about these hundreds of emails and documents and approach the police.”
He also received a phone call, again targeting his daughter’s upcoming show. “I recognised it as Darren. He said he was going to destroy her again and this was a threat to her and her gig.”
The businessman had already received a demand for £100,000 for the blog’s removal from Cooper, one of three separate payment demands for different amounts.
“It was another attempt to solicit payment to see if we were prepared to pay for the content to disappear. We did not respond as we thought he was getting desperate.”
Another email from Cooper threatened to go to the national press with his allegations.
“This was another attempt by the accused to embarrass us by making it a story and threatening to go to the press with a non-story.”
The campaign did result in the CEO leaving a board associated with one large blue chip company and distancing himself from a charity, where he was a mentor.
“It worried me that my reputation would be ruined by these allegations,” he told the trial.
A few weeks after the court’s ruling Cooper created a blog, which described the businessman in the headline as a ‘Paedo’ adding he ‘lies in court about previous sexual abuse allegations.’
Cooper also wrote about ‘lies exposed’ regarding the tech boss, accusing him of drug dealing and addiction; child pornography; cocaine supply and making false accusations.
“The blog posts were sent to the family and others, including board members of the man’s company to denigrate his reputation and the rest of his family,” explained the prosecutor.
Cooper messaged the businessman’s model daughter: ‘OMG. I saw on twitter your dad raped you, b******.’
He also threatened to damage her career by writing she was involved in child pornography, which was still available on the dark web.
“This campaign has caused serious distress to the family and the daughter says she has lost modelling work and has been unable to post on social media,” said Mr Whitley.
Cooper and Kleinhentz were both arrested, but police charged only the defendant, who admitted in a statement creating the blogs and emailing the family.
Cooper told officers both he and his husband were the victims of “slurs” and he was simply “trying to shine a light on abuse,” complaining his husband didn’t receive justice at the High Court.
Trial continues……..








