A teenager has told a murder trial how she witnessed a boy stabbing her boyfriend twice as they were getting ready to leave a beach.
Keryn Knox, 19, told the High Court in Glasgow that Cole Turley stabbed her boyfriend Kayden Moy as he was trying to get back up after slipping on sand dunes.
Turley, 18, has admitted murdering Kayden, 16, from East Kilbride, South Lanarkshire, who died following the incident in Irvine, North Ayrshire, on May 17 last year.
Jay Stewart, 18, and a 15-year-old boy who cannot be named for legal reasons are on trial at the court accused of murdering Kayden while acting along with Turley.
Ms Knox said she and friends travelled to the beach that day and met up with Kayden and other young people from East Kilbride, who were enjoying the sunshine and drinking.
She told the court that as they were getting ready to leave at around 6pm, she became aware that Turley, Stewart and the 15-year-old were at the top of the dune hill shouting and rocks were being thrown down on to the beach.
She said she thought the trio were “looking for a fight” and Kayden, who had been looking for his jacket as they were planning to leave, went up on his own to confront them.
Prosecutor Liam Ewing KC asked Ms Knox what she did and what then happened.
Ms Knox said: “I went up with him to try and stop him. At that point he had run up the hill and he was just shouting stuff back.
“Then Cole ran in from the side and Kayden has seen a blade and when he tried to run he slipped, and when he tried to get back up Cole has stabbed him in his left lower side twice.
“After that Kayden got up, I don’t think he realised what had happened, he ran back to the bottom of the beach and Cole ran.”
Asked what the other two boys did at that point, Ms Knox said they had not run away but Turley then came back to get them and they left the scene.
Describing Kayden’s condition, she said: “On the beach Kayden was on the floor and his body turned completely white and his limbs were blue and people were crowding round him, trying to put his T-shirt over the wound.”
The court heard police, paramedics and an air ambulance arrived at the scene.
Under questioning from Stewart’s KC Donald Findlay, Ms Knox was asked about discrepancies between the statement she gave police and what she said in court.
She was asked about where she had heard about Stewart holding a knife at the time of the incident, with Ms Knox saying she had heard this on social media.
Earlier the court heard from Jay Mooney, 18, who was also part of the group of friends at the beach.
Jurors heard a pre-recorded video interview that he gave on oath in April this year.
Mr Ewing read out a social media message he told the court was sent by Stewart to Mr Mooney in the spring of 2025 and in which he says he will “rip wee Kayden’s lungs out of him” and refers to a “bunch of grasses”.
Cross-examining the witness, Mr Findlay said using such apps is an “easy way to be abusive” without necessarily doing anything about it, to which Mr Mooney agreed.
He asked whether the teenager went to the police or complained to anybody about it, and was told he did not.
It is alleged that while acting with Turley, Stewart and the 15-year-old pursued Kayden, causing him to fall to the ground, and repeatedly stabbed him on the body with a knife, leaving him so badly injured that he died.
Stewart and the 15-year-old deny all charges against them and have lodged special defences of incrimination.
They two boys face a number of other charges, including that Stewart is accused of having a baton and a knife or similar instrument and the 15-year-old of having a knife on May 17 last year.
They are also accused of challenging others to fight and brandishing knives and a baton or similar instruments at Irvine beach on May 17 last year.
It is also alleged they “culpably and recklessly” threw rocks at members of the public there, placing them in danger of injury.
They are also accused of attempting to pervert the course of justice between May 17 and 21 in Irvine, East Kilbride and elsewhere in a number of ways.
Stewart is also accused of sending threatening messages to Mr Mooney on social media in May last year.
The trial continues before Judge Lord Scott.
