A teenager accused of murdering another youth at a beach later boasted of ‘doing him’, a court heard.

Kayden Moy, from East Kilbride, died following the incident at Irvine beach, in Ayrshire, on May 17, 2025.

A jury was told that Cole Turley, 18, had earlier pleaded guilty to the murder, as two other teenagers went on trial.

Jay Stewart, 18, and a 15-year-old boy, who cannot be named for legal reasons, appeared at the High Court in Glasgow on Wednesday accused of murdering Kayden, 16, while acting along with Turley.

Stewart and the 15-year-old deny all charges against them and have lodged special defences of incrimination.

The trial had previously heard that Turley, Stewart and the 15-year-old were part of The Murray Boys gang of East Kilbride, Lanarkshire. Mr Moy and his friends were said to be members of the rival Himshie gang.

Jurors heard evidence from 24-year-old Kelsey Robinson.

She stated that she was out for a walk at the beach with her partner and baby that night.

Miss Robinson claimed that she heard a lot of shouting and screaming coming from sand dunes in the distance which she likened to a ‘school fight’.

The witness believed that she saw someone get punched and the person who did it ran away.

Miss Robinson stated that three teenagers ran in her direction with a topless youth holding a knife in front of the others.

The witness said: ‘Just before he got to the bottom, as he was jogging, he kneeled down and stabbed the knife in the grass and got up and continued to run.’

Miss Robinson stated that it appeared to be a kitchen knife with a black handle.

Prosecutor Liam Ewing, KC, asked the witness if she had a view on what he was doing with the knife and Miss Robinson replied: ‘Maybe cleaning it.’

She stated that the trio walked by her and she heard the teenager with the knife shout: ‘I have just done him.’

Mr Ewing asked: ‘What was his demeanour?’

Miss Robinson said: ‘As if he was proud of it, as if it was something to shout and boast about, not like a panic like “what have I just done?”.’

The witness also recalled the teenager with the knife ‘shouting “one nil”’.

Jemma Bruce, 23, told jurors she and a friend were approached by three teenagers.

She said: ‘They just ran towards us quite frantic in a panicked state covered in blood.’

Miss Bruce stated one of the teenagers ‘stuffed’ a knife into the waistband of his trousers.

She added: ‘They asked me and my friend where they could get a taxi to get out of here pretty quick.

‘I thought they had been stabbed and we were concerned.’

Jurors heard that the woman’s friend took a video of the trio which was shown to the court.

Miss Bruce claimed that she heard one of them say ‘they just took a picture of us’.

The teenagers were then said to have hidden in bushes.

Paramedic Craig Stroat, 56, was the first medical personnel to arrive at the scene.

He told jurors that Mr Moy was ‘unconscious, unresponsive and not breathing very well at all’.

Mr Stroat stated that he gave Mr Moy oxygen to assist with his breathing and shortly after he went into cardiac arrest.

The witness told the court that he and his colleague then gave Mr Moy CPR.

Mr Ewing asked Mr Stroat if he was able to observe any injuries and he replied: ‘Yes, as far as I could see he had a stab wound to his left side. There wasn’t blood showing.’

Mr Stroat stated that Mr Moy was given treatment by a consultant led team ‘for a long time’ which included a blood transfusion at the scene.

Mr Moy was taken to a hospital in Kilmarnock by a road ambulance. Jurors also heard that an air ambulance arrived at the beach.

The trial continues before Judge Lord Scott.