A private social worker who oversaw the return of Ellie Butler to her killer father and was later questioned for alleged offences relating to children is no longer being investigated.

Steve Atherton, who worked with six-year-old 11 months before Ben Butler murdered her, was interviewed under caution following allegations that children were inappropriately filmed at a swimming pool.

He was interviewed voluntarily by police on November 7 and was not arrested.

RELATED: 'Evil' Sutton dad Ben Butler jailed for minimum of 23 years for murder of daughter Ellie

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Ellie’s grandfather Neal Gray is fighting for an inquiry into the events that led to her death

Police have now confirmed no further action will be taken and that no evidence of any indecent images of children was found.

A Metropolitan Police spokesman said: "Police in Hillingdon received an allegation of alleged inappropriate filming of children at a swimming pool in Pines Close, Northwood by an individual in July.

“One man aged in his 50s was voluntarily interviewed under caution in relation to this matter on 7 November.

“The matter has now concluded with no further action being taken. No evidence of any indecent images was found."

The probe related to children being inappropriately filmed at a swimming pool in Northwood, London, in July this year.

Mr Atherton helped in the process that saw Ellie returned to her father. After the girl moved back to the family home, in Westover Close, Belmont, Ellie was found dead in October 2013.

The 57-year-old, from Reading, works for the private social work consultancy Services for Children (S4C).

Butler was jailed for 23 years for his daughter’s murder in June this year.

His partner Jenny Gray was jailed for child cruelty and perverting the course of justice after she helped to cover it up.

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Butler was sentenced to 23 years in prison while his partner Jenny Gray was handed 42 months for perverting the course of justice

Ellie’s grandfather Neal Gray is fighting for an inquiry into the events that led to her death.

Selena Lynch, the senior coroner for south London, is considering whether to reopen the inquest into Ellie’s death.

Justice Mary Hogg, the judge who handed the six-year-old back to her parents, appointed S4C to Ellie’s case.

The consultancy were instructed by the family court to carry out an independent assessment and oversee the child’s return to Butler and Gray.

A testimonial on S4C’s website reads: “Steve Atherton and Cath Harris are first-rate social workers who provide a first-rate service.

“I have recommended them in the past and would have no hesitation about recommending them in the future.”