A teenager used "horrific" levels of violence to rape and murder a 14-year-old girl whose partially-clothed body was found in a park, a court has heard.
The 16-year-old youth is alleged to have used a hammer-like weapon to fracture Viktorija Sokolova's skull in a pavilion known as the "black house", before sexually abusing her dead body.
A jury at Wolverhampton Crown Court was that told the boy, who cannot be named because of his age, had used Facebook's messaging service to arrange to meet Viktorija in the city's West Park.
Opening the case against the youth, who denies murder, rape and sexual penetration of a corpse, prosecutor Jonathan Rees QC said Viktorija's body was found by a dog-walker at about 7am on April 12.
Mr Rees told the jury of eight women and four men: "As he walked into the heart of the park, he saw what he initially thought was a blow-up doll resting on a park bench.
"At first, he dismissed it as some sort of prank and continued with his walk.
"However, on returning to the same area, he realised, no doubt to his horror, that the figure was the body of a young girl."
The court was told that the top half of Viktorija's body was found "draped" over the arm of the bench.
Describing her injuries, Mr Rees said: "The post-mortem examination of her body revealed that she had been subjected to a sustained and ferocious attack to the head, which involved a minimum of 21 blows.
"The force of the attack was such that it caused multiple fractures of the underlying skullcap and her facial skeleton.
"In short, to put it into lay-person's terms, her head had been smashed in."
Alleging that the defendant had dragged his victim's body around 150m to the bench, Mr Rees said: "The evidence indicates that Viktorija had died before she ended up being positioned over the park bench in the way that I have described.
"Whatever the nature of the sexual activity, the prosecution say that this is a case of murder, in that the evidence establishes that it was the defendant who carried out the fatal attack, and at the time he did so, he intended either to kill Viktorija or to cause her really serious bodily injury."
Jurors were told that the boy accepts meeting Viktorija in the park, where he claims consensual sexual activity took place.
Mr Rees said: "We understand it is his case that Viktorija was alive and well when he parted from her in the park in order to go home.
"It follows therefore, on his case, that someone else, or some other people, must have come along after he left and were responsible for attacking her and stripping her, before leaving her partially naked over the bench."