"Rebecca and her mother Sonia had both been delighted when Davies, an academically gifted boy from a churchgoing family, arranged to meet her again," it reported.
"When her daughter failed to come home,
Sixteen-year-old Joshua Davies has been found guilty after murdering Rebecca Aylward, 15, in October 2010.
Swansea Crown Court was told that Davies, from Aberkenfig in Wales, lured the girl to a secluded spot where he killed her to win a bet over a free breakfast, Britain's Daily Mail has reported.
Mrs Aylward's reaction was to tell her sister not to worry adding: 'She's safe, she's with Josh.'
"By that time Rebecca had been bludgeoned with a rock the size of a rugby ball - and Davies was trying to cover his tracks on Facebook."
The Mail said the "chilling case" had highlighted how Davies used the internet, text messages and "an array of social networking sites to plot her death".
"A few weeks before the murder, one of his friends had joked that he would 'buy him breakfast' if he carried out his threat," The Mail said.
"Two days before he killed Rebecca, Davies told him: 'You may have to buy me a breakfast.'"