A computer engineer has pleaded guilty to murdering a 14-year-old boy he met after playing video games online.
Breck Bednar was found with a fatal neck wound at a property in Grays, Essex, in February.
At the time of his death, his family, from Caterham, Surrey, said he had left home after arranging to meet a friend online.
Daynes had denied murder but changed his plea on the day he was due to stand trial at Chelmsford Crown Court.
Dressed smartly in a grey suit with a white shirt and tie when he appeared in the dock, Daynes said "guilty" as the court clerk read the charge to him.
The victim's father, oil futures trader Barry Bednar, who is originally from Houston, Texas, was in court to hear Daynes' guilty plea.
Breck's mother, Lorin LaFave, said she was "heartbroken and lost" by his death and warned of the "dangers of online predators".
Following Breck's death, a person claiming to be his cousin posted a message on Facebook saying he had gone on to the web after struggling to make friends.
The teenager was described as an "incredibly smart, funny and cute" boy who "turned to his computer and the internet for entertainment".
Barrister Richard Whittam QC said it was the prosecution's case that the murder "involved a sexual, sadistic motivation". Daynes, flanked by two security officers, looked straight ahead and showed no emotion during the hearing.
Mrs Justice Cox adjourned sentencing to 12 January.