A convicted child sex offender who battered his girlfriend and threatened to kill her wrote a hate-filled 10-page letter to her from behind bars.

Vile Stefan Readenour claimed his assault on the 21-year-old was her own fault for giving him “attitude” and forcing him to lead a “boring life”.

German-born Readenour sent the letter despite being under a non-harassment order which banned him from contacting his victim, the Daily Record reported .

On Monday, the former fast food worker admitted attacking the woman and screaming: “I want you to die in this house,” when she threatened to leave him.

The thug dragged her downstairs, threw himself on top of her and pulled clumps of her hair out.

Falkirk Sheriff Court heard he launched his attack at their home in the town’s Hayfield in August after receiving deportation papers.

He also urinated on her clothes and threw them down the toilet. His victim was only saved after pleading to her mum for help on Facebook.

The letter – which he addressed to an imaginary friend – was sent while he was on remand prior to Monday’s hearing.

In it, Readenour, 29, bragged he was going to “get rich” from his victim if she testified against him in court.

He said he planned to sue her for £100,000 and police Scotland for £1million, claiming harassment and wrongful arrest.

The sex pest – who was convicted of grooming a 12-year-old for sex while living in Indiana, USA, in 2004 – wrote: “After all this and I don’t know why I still love her.

“All this because she gave me an attitude that night because I accidentally kicked a pillow off her bed.

“She doesn’t even realise she gave me attitude. She has an attitude problem. She will regret all this.”

Readenour – who hid his sordid past to get work in Scotland – continued that his victim would be “miserable living in depressing Scotland” and added: “I hope she’s kicking herself in the a**, maybe she needs to look at giving me attitudes all the time and do stuff with me outdoors and stop leading a boring life.”

Readenour also claimed to be suffering from leukaemia but said he has refused to tell doctors at Barlinnie jail.

He wrote: “I was diagnosed in July. I didn’t go to the docs here as I don’t trust them. I contacted my doctor in Germany. I don’t want her at my funeral and that’s my right. Females are nothing but drama. I have to realise British females love the phrase, ‘I am going to the police’.”

He finished his rant with: “She has destroyed a third holiday as I was going to take her to Rome, Disneyland Paris. She is a scaredy cat and I hope she keeps her ring in memory of me.”

Readenour remains in custody and will be sentenced on December 17. He is subject to deportation proceedings.