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A teenager who murdered a "happy, loving and vibrant" school friend in a frenzied knife attack has been jailed for life.
Craig Roy will spend at least 18 years in jail for the "brutal, sustained and merciless" attack on 16-year-old Jack Frew.
The 19-year-old stabbed his victim 20 times with a kitchen knife in secluded woodland near his school in East Kilbride, South Lanarkshire, in May 2010.
Roy was convicted of murdering the teenager at the High Court in Glasgow last month. He claimed the younger boy had pestered and tried to blackmail him for sex.
Sentencing him to life in prison at the High Court in Edinburgh on Thursday, Lord Doherty said: "At the time of the offence you were aged 17 years 10 months. You had no previous convictions.
"You armed yourself with a knife which you brought to the scene of the crime. Using it, you carried out a brutal, sustained and merciless attack, which left your victim dead and mutilated."
The judge told Roy that if he was released back into the community, he would remain on licence for the rest of his life.
During a 12-day trial at the High Court in Glasgow, the jury heard that Roy had cheated on his long-term boyfriend Christopher Hannah with Jack and was plagued by guilt over his infidelity.
He admitted stabbing the openly gay teenager but claimed to have no memory of it.
On the night of the murder, he said Jack sent a text message telling him to meet him in woods near their school. He claimed to have taken the knife to the meeting to "scare" the younger boy into leaving him alone.
Jack's windpipe was cut open, his lungs punctured and there was knife damage to his ribs.
Instead of calling an ambulance for the dying teenager, Roy phoned his boyfriend for help for himself.
It took a jury less than two hours to return a unanimous guilty verdict.
After the conviction Jack's parents Lorraine and Robert Frew said their son was "a happy, loving vibrant boy who loved life and brought fun and laughter to every situation".
They added: "Jack loved people, had the world at his fingertips with a promising future ahead and he would have made the most of every minute."
Craig Roy, found guilty of the murder of Jack Frew, has been sentenced to  by Judge Lord Doherty after a trial at the  in Scotland lasting twelve days. In court, Doherty told Roy he "carried out a brutal, sustained and merciless attack". 

Roy confirmed that in May 2010 he stabbed Frew with a cooking knife twenty times in woodland close to  in the town of , , where the two were classmates. Frew had previously contacted Roy by text, asking to meet him at this location, Roy explained. Roy spoke of his intention being to "scare" Frew when bringing the knife to their meeting and claimed he could not recall stabbing him despite admitting it. During the attack Roy, who was aged seventeen at the time, managed to slit Frew's throat, damage his ribs and puncture his lungs. According to Doherty, Frew was left "dead and mutilated". Wounds on Frew's hand indicated he had unsuccessfully attempted to defend himself.

The jury at the High Court was told that Roy was feeling guilt because he was unfaithful to Christopher Hannah, his long time boyfriend, with Jack Frew, an openly homosexual 16-year-old. Roy told the court Frew attempted to blackmail Roy into having sex with him.

In the minutes following the attack, Roy did not contact the emergency services. However, Roy contacted Hannah via telephone. Having travelled to the scene of the attack, Hannah told the court: "Craig had blood all over him. I was worried he was hurt. He wasn't saying anything. He wasn't making sense. He looked bewildered. There was a knife in his hand." He stated of Frew: "His neck was cut. It was open. I knew he wasn't alive."

The defence had attempted to get the murder charge reduced to one of  on the grounds of Roy having a personality disorder. Roy claimed he suffered from anger management difficulties, choosing to conceal his emotions publicly before going on to "explode" when not in a public place, . Three psychologists at the trial providing evidence to the jury stated that when Roy committed the murder he suffered from neither mental impairment nor personality disorder. The defence's claim was ultimately rejected by the jury. All members of the jury were agreed upon the guilty verdict after deliberating under two hours.

After the trial, in a statement, Robert and Lorraine Frew described their son Jack as "a happy, loving vibrant boy who loved life and brought fun and laughter to every situation".

Roy is to remain in prison for at least eighteen years before gaining the right to apply for parole. If granted parole, Roy must adhere to set licence conditions until his death.