A 14-year-old girl found raped and murdered in a park was hit with a hammer so hard her teeth fell out.
Viktorija Sokolova, from Wolverhampton, was found slumped on a bench by a horrified dog walker in West Park, Wolverhampton, on April 12.
A 16-year-old boy, who cannot be named because of his age, is accused of rape, murder and sexual penetration of a corpse.
He denies the charges.
The pair had been in contact via Facebook in the lead up to the horrific attack.
It is alleged the teenager fractured Viktorija’s skull with a hammer in a pavilion known as the “black house”, before having sex with her dead body.
The court also heard how traces of her stepfather’s DNA was found on her underwear and the jeans discovered at the scene, although they slammed involvement with the murder, calling it “nonsense”.
Saidas Valantinas, the victim’s mum’s husband, said he did not know how his semen came to be on her clothing
Neither Karolina Valantiniene or her husband Saidas Valantinas are facing any charges in the trial.
Adam Kane QC, representing the accused, asked Mr Valantinas: “Is the real reason why your DNA is disposed as it is, on Vikorija’s knickers, because you found her in the park and that you sexually assaulted her?”
He replied: “This is nonsense, I deny this completely.”
Mr Kane then asked: “Was the consequence of the sexual assault, that there then followed a violent assault, did you kill her?”
The farm labourer replied: “I did not do this, this is nonsense.”
When Mrs Valantiniene was asked by Mr Kane: “Are you seeking to protect your husband’s involvement in the fatal assault on Viktorija?”, she replied: “No, this is nonsense.”
When asked ‘did you kill your daughter’, she replied: “No.”
Then asked if her husband had killed her daughter, she again replied: “No”.
The mum said her daughter had become “troubled” in the lead up to her death.
According Mrs Valantiniene, she had been running away from home, smoking cannabis, drinking and staying out late with friends.
She told the court how Viktorija’s school attendance had been drastically effected by her behaviour and that things had got so bad she was sent to live with her father in Ireland.
Factory worker Karolina and her husband Saidas married in 2006.
The teen returned to Wolverhampton in February this year and according to her mum, their relationship was “ideal”, but within weeks she had “fallen back to her old ways”.
As punishment, her mum burned some of her clothes and took away her iPhone in March – just a month before her untimely death.
To get back at her, Viktorija stole her mum’s bank card and took out £250.
When police arrived at the scene on April 12 they concluded Viktorija’s teeth had been knocked out “by a violent, heavy blow” or contact with a hard surface.
A court also heard how other items were discovered at the scene – a blood-soaked Nike cap, a pair of “heavily bloodstained” white jeans with a pair of black knickers inside, a pair of boots at the edge of the lake and Viktorija’s phone in the water.
The Crown’s case is that the accused used Facebook messenger to arrange to meet the young girl.
The trial continues.