A "controlling" killer has been jailed for life for murdering his girlfriend's 23-month-old daughter.
Jonathan Garner, 26, was sentenced to a minimum of 20 years behind bars after he deliberately smothered toddler Mia Gregson.
Mia's mother Samantha Gregson, also 26, was sentenced to four years in prison for allowing her daughter's death at their home in Hull.
Gregson wept during sentencing at Sheffield Crown Court on Wednesday after it emerged she "knew her daughter was being mistreated" for around a month before her death.
Mia was just 23 months old when she suffered cardiac arrest at her home in Gipsyville, on February 13, 2014.
The judge, Mr Justice Goss, said he believed Garner had tried to smother Mia before, and was responsible for a series of other injuries found on the little girl's body during post-mortem examinations.
He told Garner: "This was a bad case of child cruelty involving abusive and violent behaviour and, ultimately, the use of fatal violence on a very young and vulnerable child."
The judge said he accepted that Gregson, who has had two more children since Mia's death, was controlled and abused by Garner, and that she had been a loving mother to her daughter before the relationship started.
But he told her: "You were warned at the outset that Jonathan Garner posed a risk to Mia and his subsequent behaviour confirmed that."
Garner "bullied, threatened and injured" Mia throughout the time he lived with her, Mr Goss said.
He explained that Gregson had been warned by social service about Garner's history of domestic violence and that he was not to have contact with her daughter, but she ignored the warning.
He told her: "You failed to act on the obvious injuries Mia was suffering and must have been aware of the ongoing risk that your partner posed to the heath and well-being of your daughter."
Over an eight-week trial, a jury how heard how Mia was taken to hospital on February 13, 2014, but died later.
The judge said the couple "peddled lies" about what happened in the terraced house on Dorset Street.
Robert Smith QC, for the prosecution, said Garner was heard by neighbours "regularly, if not almost constantly" shouting at the little girl.
He told the jury: "The shouting took the form of threats of violence towards her and was motivated by Mia's crying."
The court also heard that police were called to the home less than three weeks before the tragedy.
Officers responding to an anonymous call from a neighbour concerned about "hideous" yelling from the house found Mia asleep.
They accepted Garner's explanation that he had been shouting at the dog.
The night before Mia's death, Mr Smith said a neighbour heard Garner shouting at her: "Shut the f*** up. Stop screaming at me. Get to bed."
The neighbour heard shouting again at 7am, saying: "I'm going to f***** belt you," the prosecutor added.
Garner, of Thirlmere Avenue, Hull, and Gregson, of Melling Close, Chesterfield, denied the offences but were found guilty by the jury on Tuesday after almost a day of deliberations.
Detective Superintendent Matt Baldwin, from Humberside Police, said: "While I am pleased that justice has been achieved, sadly it does not bring Mia back.
"Mia suffered tragically at Garner's hands while Gregson allowed weeks of neglect and abuse to go on against her daughter, leading ultimately to her tragic death.
"I am confident following the sentences today, it will serve to protect any other children coming to any harm from the pair, as they will both be behind bars for a long time."
