An obsessive loner who sent a Battersea escort girl photographs of his own slit wrists told the Old Bailey this morning he could not remember stabbing her.

Vikramgit Singh, 25, claimed he followed his ex-girlfriend, Gemma Dorman, 24, to Clapham Junction simply to “talk to her” on July 31 2008.

But on arrival, he was overcome by jealousy after she allegedly sent him voicemail recordings of herself having sex with other men, the court heard.

He said: “I said to her I just want to speak to you but she was swearing at me... Then I can’t remember what happened.

“I started hearing all the voices from her sexual acts in my mind. Her having sex with someone. After a while I heard her voice saying 'no, no'. Then I saw blood on my hand. I had a knife in my hand.”

Mr Singh, an illegal immigrant from India, earlier told the court he met Miss Dorman in 2006 when he rented her out as an escort for his friend.

He said Miss Dorman became his girlfriend, promising to marry him and quit her work at Vixens Escort Agency.

While they were together, he allegedly gave her a total of £260,000 for a Porsche, plastic surgery, holidays and a house for them both to live in.

Mr Singh slit his wrists when he suspected she was still working, and she broke it off in May 2008, when he had no money left, the court heard.

He later received a threatening phone call from a man claiming to be her new boyfriend, and began carrying a knife to protect himself.

On the day of her death, Mr Singh followed Miss Dorman and her boyfriend to Lavender Hill, in Clapham Junction, where he waited in a bar outside the Amazing Thai restaurant.

He told the court he saw her kiss the man and approached her to ask for half of his money back when she popped out to get cash.

Mr Singh, of Ruskin Road in Southall, denies murder. The trial continues.