Who DID kill little Summer? Inquest hears how toddler's mother, stepfather and grandmother were arrested over her 'non-accidental' death - but no-one was charged

• Summer Rogers-Ratcliffe died of a blunt force injury to the head in 2012
• Mother, stepfather and grandmother all arrested on suspicion of murder
• CPS did not charge any of them as 'it was not clear who was caring for Summer at the time', the inquest continues