Jamie Reynolds, 23, has pleaded guilty to murdering Georgia Williams, 17, by strangling her after luring her to his home.
A shop worker lured a police detective's teenage daughter to his home and took pictures of himself strangling her to death, it has been revealed after he admitted her murder.
Former head girl Georgia Williams, 17, was choked to death by Jamie Reynolds, 23, after she spurned his advances.
It emerged earlier that he took a sequence of pictures showing events "before, during and after" the murder before driving her body to North Wales where he dumped it in woodland then going on the run.
Police piecing together Miss Williams’ last moments found the distressing images as well as extreme pornographic images which Reynolds had pasted over with images of his friends faces.
They also discovered sexual stories that he had written about Miss Williams, Stafford Crown Court heard.
The court heard Reynolds had lured Miss Williams to his home in Shropshire, on May 26 this year, offering to take photographs of her for a modelling portfolio.
But when she arrived he strangled her to death.
The prosecutor told the court that there were photographs which only the judge would see moments before and after Miss Williams’ death.
He said: "There is photographic evidence relevant to the act moments before and after the murder took place.
"There are also photos of innocent girls who put their pictures on social networking websites that have been corrupted by the defendant.
"There are also certain story lines the defendant has written that we have found."
It also emerged that Reynolds, who worked as a petrol station attendant, had a fascination in extreme pornography and would superimpose the faces of female Facebook friends onto the bodies of naked women.
Police seized between 30 and 50 images but it was unclear whether they included Miss Williams.
Reynolds also wrote down sexual fantasies about Miss Williams which were discovered in a notepad in his bedroom.
Warning him he faced life in prison, Mr Justice Wilkie expressed relief on behalf of the family that they had not been forced to endure a trial.
He said: "Some details are of such nature for it to be given wider publicity would cause untold distress."
Miss Williams- an army cadet who had dreamed of joining the RAF as a paramedic - was reported missing by her dad Stephen, 56, a detective constable with West Mercia Police, and mum Lynette, 51, when she failed to return home.
She had attended a photo-shoot at Reynolds' house, half-a-mile from her family home, and it is thought that she died between 8pm and 9pm that night.
After killing her, Reynolds drove 50 miles to remote woodland where he dumped her body.
He then fled to Scotland.
A UK-wide manhunt was launched and he was arrested in Glasgow outside a Premier Inn hotel in Glasgow City Centre on May 28, three days after her disappearance and before her body had been found.
Reynolds previously made advances on Facebook towards Miss Williams but she made clear she did not want a relationship with him.
He even claimed on social networking site Ask.fm he had kissed her and asked her out to a Valentine's Day party.
But on May 8, just weeks after she updated her status to say she was in a relationship with Matthew Bird, Reynolds wrote on the site: "Whenever I arrange dates they either never happen or the girl magically gains a boyfriend.
"And it's worse when you actually like someone, your stuck, happy their(sic) happy but unhappy cos it's not you."
Reynolds also moaned about being "cursed" when it came to women and wrote that he would be "forever alone".
He said: "Plus I'm still kinda recovering my confidence even now from the girl I fell hopelessly in love with, and fighting didn't save that!"
At the time of the murder her friend Katy Lafferty, 17, revealed: "Georgia said Jamie did fancy her, but she made it obvious she wasn't interested.
"She just told him that their relationship was nothing more than a friendship. Apparently he tried to kiss her once, but she rejected him. I think it was a while ago though."
Georgia was Head Girl , a member of the student council at New College, a corporal with the 1130 Wrekin Squadron Air Training Corps and a volunteer member of AFC Telford United's Match Day Safety team.
Her parents and older sister Scarlett, 22, stared intensely at Reynolds who wore a dark suit, a striped shirt and a purple tie, during the 20 minute hearing.
The Georgia Williams Trust was set up in the weeks after her murder to provide a lasting long-term legacy for her local community.
Set up at the specific request of the teenager's family, the trust celebrates her life and achievements by enabling young people to access adventure, outdoor activities and volunteering.
Reynolds will be sentenced on December 19.
TIMELINE OF EVENTS
26/5/13 – Miss William is reported missing from her home by her worried parents.
28/5/13 - Jamie Reynolds is arrested on suspicion of kidnapping her 280 miles away at a budget Premier Inn hotel in Glasgow city centre.
30/5/13 - Reynolds is arrested on suspicion of murder even though her body has not yet been found.
31/5/13 - Reynolds is charged with murder after her body is found dumped in woodland near Nant-y-Garth pass near Wrexham, North Wales.
1/6/13- Reynolds appears at Telford Magistrates Court and is remanded in custody.
4/6/13- Reynolds appears before Stafford Crown Court for a 10-minute preliminary hearing as police reveal she was killed by being choked to death with a ligature.
11/6/13 - Friends and family launch the Georgia Williams Trust
14/6/13 - Hundreds gather for Miss Williams’s funeral at All Saints Church, in Wellington.
3/10/13 - Reynolds appears at Birmingham Crown Court where he pleads not guilty to her murder
2/12/13 - Reynolds changes his plea to guilty in the first day of his trial at Stafford Crown Court.