A man who “identifies as The Joker” who was “obsessed” by his ex-girlfriend whom he called “his Harley Quinn” attempted to kill her by strangling her twice after she “rejected him”, a court has heard.

Anthony Yewman, 45, of Romford, Essex, is on trial at Southampton Crown Court accused of the attempted murder of Jenny Dalton and alternative charges of attempted GBH and intentional strangulation.

Matthew Farmer, prosecuting, said the pair had a “difficult” on-off relationship for about two years with the defendant becoming “increasingly obsessed” with Ms Dalton.

He told the jury: “He referred to himself as The Joker, that is The Joker from Batman, he identified as The Joker, and he calls her his Harley Quinn.

“Some of you may know, there is The Joker, the arch-nemesis of Batman and there is his sometime girlfriend Harley Quinn.”

Mr Farmer described how Yewman had “stalked” Ms Dalton after their relationship had broken down including by “camping out” in her garden for a number of days, refusing to leave until she called the police and he was arrested for this.

And on another occasion after an argument, he had spray-painted on her garden wall: “I am sorry, I love you, you are my soulmate”, and: “Met my soulmate when met you”.

Mr Farmer said: “He became more and more obsessed about her, she describes significant controlling behaviour by him and his stalking was such that she couldn’t get away from him.

“He didn’t allow her to go out to the shops alone without him being present.”

He added that Ms Dalton went away with friends to Ibiza and when she returned he was waiting for her with flowers which prompted her to try to get away from him by moving into a women’s refuge in Seaford, East Sussex.

Mr Farmer said that the defendant managed to contact Ms Dalton and arranged to meet her before following her back to the refuge.

Then in August he persuaded her to return with him to her home in Fordingbridge, Hampshire, on the understanding that they were “ex-partners”, Mr Farmer said.

But two days later, on August 30, after Ms Dalton made it clear that their relationship was over, Yewman attempted to strangle her in her bedroom, the court was told.

Mr Farmer said: “Mr Yewman turned up at the refuge over a period of days and eventually got her to come away with him and they went back to Fordingbridge.

“It was made plain to him that he was her ex-partner but the prosecution case is that he couldn’t accept that she was effectively rejecting him and it was against that background that he tried to kill her by strangling her not once, but twice.”

Mr Farmer described how Ms Dalton passed out after Yewman attempted to strangle her but came to and saw him attempting to cut his own throat with a craft knife before she told him to stop.

The prosecutor added: “She, helpless, vulnerable and scared after the first attack, describes him lifting her on to the bed, placing both his hands around her neck and trying with all his might to squeeze the life out of her.”

He said that Yewman stopped only when Ms Dalton’s 21-year-old daughter Juliette banged on the door causing him to “release his grip on her throat”.

Mr Farmer said that the daughter then called police and her mother, who was “struggling to breath because her neck was swollen internally”, was taken to hospital.

He added that Ms Dalton was left “severely traumatised” by the attack.”

Mr Farmer said that Yewman told police in interview that he had not meant to hurt Ms Dalton but had acted in self defence and had only “retaliated after she grabbed him”.

The prosecutor said that Yewman added: “I love her more than anything in the world.”

Yewman, who was in the dock with his hair parted in a curtain style and wearing a blue jumper, denies the charges and the trial continues.