ITV Wales reporter Hamish Auskerry reports from outside Cardiff Crown Court
The mother and stepfather of a five-year-old boy whose body was found dumped in a river have been found guilty of his murder.
John Cole, 40, and Angharad Williamson, 31, of Sarn, Bridgend, were convicted of killing Logan Mwangi by a jury of five men and seven women at Cardiff Crown Court on Thursday after five hours of deliberation.
A 14-year-old boy, who cannot be named because of his age, was also found guilty of murder.
Williamson screamed "no, no, no" as the verdicts were returned.
Judge Mrs Justice Jefford had to interrupt the jury and the clerk to tell Williamson to be quiet before the verdict against the youth was given.
"Out of respect for your son and the youth please be quiet for the verdicts," she said.
Logan, a previously "smiling, cheerful little boy", was discovered in the River Ogmore in Pandy Park, Bridgend, on the morning of July 31 2021.
Police officers found him partially submerged wearing a pair of dinosaur pyjama bottoms and a Spider-Man top just 250 metres from his home.
The youngster had suffered 56 external cuts and bruises, and "catastrophic" internal injuries, which were likened to a high-speed road accident.
Experts said the injuries could have only been caused by a "brutal and sustained assault" inflicted on Logan in the hours, or days, prior his death. They also said the injuries were "consistent with child abuse".
In the months and weeks leading up to his death, Logan had been "dehumanised" by his family, prosecutors said.
Logan's stammer is said to have worsened, becoming particularly bad around Cole. He wet himself more frequently and began self-harming.
Friends of the couple said Cole told them he did not like Logan, and others said his attitude changed after becoming obsessed with the idea Williamson had cheated with Logan's father Benjamin Mwangi.
Detective Superintendent Darren Jones from South Wales Police speaking outside court.
Medics made a safeguarding referral to the police after Logan suffered a broken arm in August 2020, with Williamson saying he had fallen down the stairs.
She took him to hospital the day after the incident and said she thought he had only dislocated his shoulder and had tried to put it back.
Later she told a friend the youth had confessed to pushing Logan down the stairs but it was not until January last year she told the police.
By March, due to concerns over Cole, Logan had been assigned a social worker.
In June, a month before Logan died, the family were removed from the child protection register - meaning it was believed there was no longer a risk of significant harm.
A foster family the youth stayed with claimed to have heard him say he wanted to kill Logan.
They said they reported the teen's "desire for violence" and threats to harm Logan to his social worker but that she seemed unconcerned - something the social worker denies.
A support worker also heard the youth, singing: "I love kids, I f****** love kids, I love to punch kids in the head, it's orgasmic."
Weeks before he died, Logan suffered a broken collarbone but he never got medical treatment.
On July 20 Logan tested positive for Covid-19 and he was shut in his bedroom with a baby gate barring him from leaving.
Ms Rees said: "He had been kept like a prisoner in his small bedroom in the flat you saw, a room likened by Williamson as a dungeon."
Williamson claimed that two days before Logan's body was found an argument about a spilt drink escalated and ended with Cole and the youth attacking him.
She accused Cole of punching Logan twice in the stomach and ordering the youth to "sweep" Logan if he stuttered or flinched.
Moments later the youth carried out the martial arts-style manoeuvre, kicking his legs out from under him while using his hand to slam his head to the ground.
Williamson said she screamed for them to stop but said Cole replied: "The only way this boy understands is pain."
Two days later, she phoned the police at 5.45am reporting Logan missing - claiming to have awoken to find him gone and accusing a woman of taking him.
Police arrived at the flat to find Williamson hysterical, while Cole and the youth could be seen walking around the area calling for him.
Prosecutors said this was part of an "elaborate" cover-up concocted by the defendants and all three were accused of perverting the course of justice, of which Williamson and youth were convicted.
Cole, who was captured on CCTV carrying Logan's body to the river from the flat, while being followed by the youth, admitted the charge.
He claimed he woke to the sound of Williamson screaming Logan was dead and he panicked.
CCTV shows a bedroom light being switched on and off while Cole and the youth were out - the prosecution used this evidence to show Williamson was awake and aware Logan was dead.
Cole said after dumping the boy's body, Williamson sent him out again to hide his ripped pyjama top.
The youth never gave evidence in the trial.
NSPCC Cymru call for safeguarding review
Following the guilty verdicts, NSPCC Cymru called for a child safeguarding practice review.
Tracey Holdsworth, assistant director of the organisation, said: "The treatment of Logan Mwangi by people who should have been caring for him was horrific, but for his death to have involved another young person is even more shocking.
"However, we cannot lose sight of the fact that one of those found guilty is still a child and the response to him must be one of both punishment and appropriate support.
"A Child Safeguarding Practice Review must now leave no stone unturned in establishing exactly what took place before Logan died and whether more could have been done to protect him.
"There must also be more investment in children's services in Wales to ensure they are able to provide comprehensive support to any child at risk of harm and be better equipped to prevent a tragedy such as this happening again in Wales."
The judge adjourned the case for sentencing at a date to be fixed.