The father of Arthur Labinjo-Hughes and his girlfriend have been jailed for the six-year-old's killing.
Emma Tustin, 32, was sentenced to life with a minimum of 29 years at Coventry Crown Court on Friday after she was found guilty of murdering the boy, who had been poisoned, starved and beaten in a campaign of "evil" abuse.
Her partner and Arthur's father, Thomas Hughes, 29, was sentenced to 21 years in prison after being convicted of manslaughter.
The judge said the trial had been "without doubt one of the most distressing and disturbing cases I have had to deal with".
Mr Justice Mark Wall QC told the pair: "This cruel and inhuman treatment of Arthur was a deliberate decision by you to brush off his cries for help as naughtiness."
Warning: This story contains distressing details about the treatment and subsequent death of a little boy
It comes after Arthur suffered an "unsurvivable brain injury" on 16 June 2020. He died in hospital the next day.
Arthur Labinjo-Hughes: Images show tragic little boy smiling with his mother before she lost joint custody after killing partner
What led up to Arthur Labinjo-Hughes's death and could it have been prevented?
Arthur Labinjo-Hughes: Father and girlfriend found guilty over death of six-year-old boy
Tustin carried out the fatal assault while in sole care of Arthur at her home in Cranmore Road, Solihull, violently shaking him and repeatedly banging his head, likely against the hallway wall.
The 32-year-old then took a photograph of the unconscious youngster on her mobile phone and sent the message to Hughes as Arthur lay dying in the hall.
It took her 12 minutes to call 999 after ringing Hughes first, and she later lied to medics and police, saying Arthur "fell and banged his head".
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The judge told Tustin she had made a "calculated" decision to kill, saying: "You are a manipulative woman who will tell any lie, and shift the blame on to anyone, to save your own skin."
He added: "You wanted Thomas Hughes so he could provide for you and your own children, but did not want to be troubled by Arthur any longer."
At the start of the pair's sentencing hearing at Coventry Crown Court on Friday, his paternal grandmother Joanne Hughes read a victim impact statement on behalf of her family.
The secondary school teacher said Arthur, as a "happy, contented, thriving seven-year-old," would "be alive today" had her son not met Tustin.
But she added: "It is also clear that Arthur was failed by the very authorities that we, as a society, are led to believe are there to ensure the safety of everyone."
Arthur's maternal grandmother, Madeleine Halcrow, in a victim impact statement delivered on behalf of the boy's natural mother, recalled his "beautiful smile" and his "kind, nurturing spirit", adding that he had been "the light of my life".
"He was let down by a person he trusted and should have protected him, left alone and isolated, and then they took him away from me," she said.
"My child, my little love, defenceless, trusting and nothing but loving, was killed.
"His short life stolen and the hole left in me and those who loved Arthur will never be repaired. Sleep well, my angel - you are truly loved."
At trial, Tustin claimed Arthur must have thrown himself down the stairs, despite evidence he was so starved he could barely stand.
Hughes, of Stroud Road, Solihull, was convicted of manslaughter after encouraging the killing by his actions, including sending a text message to Tustin 18 hours before the fatal assault telling her "just end him".
Mr Justice Wall called his actions "chilling", adding: "You were Arthur's father, in a position of trust and bore primary responsibility for protecting him.
"He was extremely vulnerable, and you lied to his school in the last days of Arthur's life to protect both you and Ms Tustin."
In court, the pair had been described by prosecutors as "utterly ruthless, unthinking and pitiless".
After his death, Arthur was found to have 130 injuries all over his body, after being hit, slapped, kicked, punched and beaten, "over and over".
Tustin admitted two other counts of child cruelty, by wilfully assaulting the boy and isolating him in the home by making him stand up to 14 hours a day in the hallway, with jurors convicting Hughes on both those counts.
Speaking after the verdicts, Ms Halcrow called them "wicked" and "evil".
She described the couple's behaviour, which included Tustin poisoning the youngster by force-feeding him salt-laced meals, as "unfathomable".
"There's no word for them, especially your own child," she said.
Ahead of the sentencing, the prime minister's spokesman described the case as "deeply distressing".
"Questions need to be answered to get to the bottom of how this happened, a review will look at local safe guarding, police, social care, professionals," he added.
"We won't hesitate to take any action off the back of that review."
An independent serious case review is under way into the actions of Solihull Council social workers who found "no safeguarding concerns" after visiting Arthur, just two months before he was murdered.
Hughes' mother, Joanne Hughes, had seen bruises on Arthur's back, with the boy telling how Tustin "called him an ugly, horrible brat" and shoved him into the stairs.
She alerted children's social services to the bruises in April, just weeks before his death.
But two social workers, who saw Arthur at Cranmore Road, had "no safeguarding concerns".
Solihull's Local Child Safeguarding Partnership is now carrying out an independent review of the circumstances surrounding the "terrible tragedy", including the actions of Solihull Council's social services.
Leader of Solihull Council, Ian Courts, said: "I am deeply shocked and appalled at the death of Arthur Labinjo-Hughes."
"I am very clear that we will leave no stone unturned to understand, learn and fix any issues that the independent review finds and any further actions that may come about through subsequent reviews and inspections."
Speaking to reporters on Friday evening, Prime Minister Boris Johnson said the government "will leave absolutely no stone unturned to find out exactly what went wrong" in Arthur's case.
"I just want to say on the tragic and appalling case of Arthur Labinjo-Hughes, like many people I find it hard to read it, let alone to understand how people could behave like that to a defenceless little child," the PM said.
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"And I must say, I'm glad that justice had been done, in the sense that they have both received tough sentences, but that is absolutely no consolation, and what we've got to make sure now is we learn the lessons about that case, we look at exactly what happened, what else could have been done to protect that child.
"And it is early days, but I can tell you this, we will leave absolutely no stone unturned to find out exactly what went wrong in that appalling case."
Education Secretary Nadhim Zahawi said he would be making a statement on the case to Parliament on Monday.
"We are determined to protect children from harm and where concerns are raised we will not hesitate to take urgent and robust action. We will not rest until we have the answers we need," he said.
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