A CARDROSS teen has gone on trial accused of murdering a schoolboy who was found stabbed to death.

Craig Roy has appeared in Glasgow's High Court in connection with the death of 16-year-old Jack Frew who was found in a wooded area with his throat slit last year.

The 19-year-old admits stabbing Mr Frew to death, but denies murdering him.

Last week jurors heard that Roy was being blackmailed by Mr Frew after the pair had engaged in some form of sexual activity.

He then told detectives that prior to the incident he had taken the knife out with him because he wanted to scare Mr Frew off before it all "got a bit blurry".

Roy, of Villafield Court, Cardross, denies murdering Jack.

The trial heard today (Tuesday) that a psychiatrist he believed murder accused Craig Roy was not suffering from mental health problems when he stabbed Jack.

Dr Sharat Shetty told the High Court in Glasgow that he examined Roy, 19, on four separate occasions and found no sign of any mental health issues.

Dr Shetty, who was a Consultant Forensic Psychiatrist with NHS Lanarkshire Mental Health Service, before taking up a post in New Zealand four weeks ago, told advocate depute Jennifer Bain, prosecuting, that he carried out a personality disorder examination on Roy.

He said he would have preferred to also have had input from Roy's family and friends, but stated: "There was no sign of a personality disorder. I'm fairly confident of that diagnosis."

The court heard that Dr Shetty first spoke to Roy in Addiewell Prison a week after Jack's death.

He said: "Craig Roy was 17 at the time. He described himself as a shy, timid individual.2 Dr Shetty said that Roy described himself as "a teacher's pet" at school and his schoolwork was good until his final year at school when it began to slip, which he claimed was in part due to his relationship with boyfriend Christopher Hannah.

Roy, then claimed that Jack threatened to tell Mr Hannah. Dr Shetty said: "He thought that Mr Frew was a threat to his relationship with Mr Hannah."

Dr Shetty said that Roy told him he took a knife with him when he went to meet Jack on May 6, 2010.

The psychiatrist added: "He said he wanted to show how serious he was and took a small knife with him.

"Mr Roy said he was not a threat to anyone and was pretty weak and took a knife to intimidate him.

"He said it showed he was serious about keeping his distance from Mr Frew. He was saying he wanted to intimidate him not attack him."

Referring to Roy reaction to Jack's death Dr Shetty said: "He expressed great remorse for what had happened and was quite tearful about it.

"He was very sad about what he had done and the impact it has had on Mr Frew's family."

The trial before judge Lord Doherty continues.