The parents of a 14-year-old girl found they were "absolute nonsense."
Factory worker Karoline Valantiniene and her husband Saida's Valantinas, who was Viktorija Sokolova's stepfather told a court on Thursday and they had nothing to do with the teenager's death as they gave evidence.
The couple, who married in 2006, gave evidence for the prosecution's case for the first time at the trial of a 16-year-old boy who was accused of murdering her daughter
Jurors were told that Mr Valantinas' semen was found to be fatally attacked on the underwear.
Seminal fluid was found on a pair of white jeans belonging to the knickers, in a bin in the park grounds.
Mr Valantinas told jurors he did not know his DNA to come to any of his stepdaughter's clothing.
The Boy on Trial, Who Can not Be Named Because of His Age, is accused of rape, murder and sexual penetration of a corpse, after the youngster's body was discovered by a dog walker in the city's West Park on April 12.
Adam Kane QC, representing Mr. Valantinas: "Is the real reason why your DNA is 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: "What the consequence of the sexual assault, that there followed a violent assault, did you kill her?"
The farm laborer replied: "I did not do this, this is nonsense."
When she asked, "You're looking 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".
Jurors at Wolverhampton Crown Court had previously heard of the schoolgirl as "horrific" levels of violence.
It is alleged the victim used a hammer-like weapon to break the victim's skull in a pavilion known as the "black house", before sexually assaulting her body.
The Crown's case is that he used to be the youngest in the city's West Park, and changed his trousers before leaving the scene.
Giving evidence on Thursday, Mrs. Valantiniene described how her daughter had become "troubled", from the summer of 2017.
Jurors heard Vikorija's school attendances had plummeted, she was running away from home, out late with other youngsters, drinking, and smoking cannabis.
Viktorija was sent to live with her natural father in Ireland, after leaving the family home in Mostyn Street, Wolverhampton.
That followed an incident on December 15, when one of the windows was smashed at the family home.
Speaking to a 999 call handler that day, Mrs Valantiniene said: "I am scared in my own house, you understand.
"I have a big problem with my daughter.
"She is a very troubled child, very troubled.
"She smokes, she sleeps with guys, and she smokes ganja.
"She's drinking and I do not know what to do because she's a very bad child."
The teenager returned to Wolverhampton in February 2018, and her mother said initially the relationship was back to being "ideal".
But two weeks later, she started running away again with her parents believing she had fallen back into her "old ways".
In March, with Viktorija spending more and more nights out of her home, her angry mother burned some of her clothes and took her away. IPhone, as punishment.
Viktorija then took her mother's bank card, withdrawing £ 250, and sparking a physical confrontation with Mrs. Valantiniene.
Viktorija could be loving, adding she believed the issues were only "temporary".
Describing the last time she kissed her only daughter on the night of Tuesday, April 10, she said: "We were about to go to sleep.
"I came to her room, gave her a hug, and kissed her for the last time."
As she left for work at 4am, on April 11, she added: "I came to see Viktorija before I left."
Her daughter went out sometime that day and did not return.
Police contacted Mrs Valantiniene the next day telling her Viktorija's body had been found.
The trial continues.
Additional reporting by PA.