• Poppy - who was even named after the plant that heroin comes from - was born a drug addict due to her mother's heroin habit, and doctors said she suffered withdrawal symptoms after birth;
• Social services were responsible for Poppy from birth, and three times closed investigations believing she was safe in her mother's care;
• Social workers were called in just six months before her death, but found out only after her death that Poppy was living in a drug dealer's den;
• Relatives criticised social services, and the local MP hit out at agencies for allowing Poppy to 'slip through the cracks';
• Pyke and Rytting fed the youngster illicit drugs they called 'Smarties' to sedate her so they could have sex;
• Poppy endured a brutal regime of physical and emotional cruelty, and was given heroin and other drugs over many months.
The youngster collapsed and died after suffering a cardiac arrest in Rytting's squalid flat in Grimsby in June 2013. Paramedics found her blue and not breathing on the sofa.
A post-mortem examination revealed she had bruising to her upper arms, legs and buttocks.
Tests of her hair showed she had been given heroin, morphine and a range of other drugs, including the 'dance drug' ketamine. Experts agreed she had been plied with substances for months.
Rytting suffered from schizophrenia and has 42 previous convictions - yet social workers knew nothing about his contact with Poppy until after she died
Police found more than 1,000 tablets of controlled - or illegal - drugs when they raided the property, used by Rytting as a base to buy and sell drugs.
However, an investigation failed to establish the cause of death and there was no evidence to prosecute the drug-dealing couple for Poppy's death. Instead they were charged with child cruelty and drugs offences.
Passing sentence at Hull Crown Court yesterday, Judge Jeremy Richardson, QC, said one or both of the couple 'know the truth' about the child's death.
He told the defendants: 'You lived your lives in a mire of drugs embracing your own drug addiction and supplying drugs to others.'
Rytting replied from the dock: 'Whatever.' Pyke showed no emotion.
The judge said Poppy was sedated with drugs during her short life, which was 'fundamentally blighted' by the couple's behaviour in a case of 'unremitting degradation'.
He said Pyke's expressions of love towards Poppy during her evidence in the trial were a 'despicable masquerade'.
Melanie Onn, the Labour MP for Grimsby, slammed agencies for failing the little girl.
'The whole town has been horrified to learn of what Poppy went through in her short life,' she said.
'That it happened in plain sight over a long period of time is the tragedy of this little girl who slipped through too many cracks in the system. After Baby P, those cracks were supposed to have been filled.
'It will long be a scar on the face of our community that more was not done to intervene to save her life.
There were mistakes made by various agencies involved with Poppy's family. Those mistakes cannot be undone, it is right that they have been accepted and all efforts should now be put into making our protection services fit for purpose.'
Pyke, a former launderette manager, began seeing Rytting when Poppy's father Brendon Widdison - a crack cocaine addict - was in jail. The new relationship effectively sealed Poppy's fate.
He and Pyke deliberately gave Poppy diazepam sedatives, which they called 'blue Smarties' because of the colour, so they could have sex.
A week before her death, Pyke sent two text messages to Rytting: 'Got a bottle of wine if u wanna share. She can have a blue Smartie and go sleep. Lol! XXX.'
In a further text, Pyke asked him: 'Do you wanna share this wine... Get them blue Smarties ready - the one she likes! Lol XXX.'
The mother went into graphic sexual detail about what she wanted to do to Rytting if only her daughter wasn't around.
Pyke, a drug addict since the age of 25, referred to her daughter as a 'little thief' and 'bitch', and was overheard telling her: 'I hate you, you little b******.'
Pyke admitted or was convicted of three child cruelty charges and three drugs offences. Rytting admitted or was convicted of two child cruelty charges and four drugs offences.
A serious case review into Poppy's death detailed numerous contacts with the little girl and her mother, and admitted 'missed opportunities' and mistakes in dealing with the tragic family.
A spokesman for the North East Lincolnshire Local Safeguarding Board said the authority was 'doing their best to continually improve their practice to keep children safe'.
He said in the three years since Poppy's death, 'significant changes have taken place' and many of the recommendations in the review had been implemented.
No individuals were singled out in the report and the council refused to comment on whether anyone had been disciplined over Poppy's death.
Speaking outside court flanked by the little girl's grandparents, Poppy's uncle, James Widdison, said the family 'didn't blame social services' for the tragedy but 'acknowledge there were failings on their part'.
Mr Widdison said none of the family was aware at the time that Poppy had been referred to social services six months before she died.
He added: 'We've waited three and a half years for this day and it doesn't get any easier.
The memories we've got of her are everlasting. We won't ever be distanced from that. There's no such thing as closure with regards to this case.'
The family last saw the girl on her fourth birthday when she was her 'normal happy self'.
Mr Widdison added: 'We couldn't have foreseen what happened and we don't believe social services could have either.'
Marilyn Hawes, founder of the Enough Abuse charity, added: 'Poppy should have been whipped away from her mother and removed from the whole scenario - but she wasn't because there are fundamental flaws with the social services system.'
Detective Superintendent Umberto Cuozzo, of Humberside Police, said: 'Poppy Widdison was betrayed by the very people entrusted to keep her safe from harm.'
He called on the defendants to 'tell the truth about how Poppy died'.
