In August, 11 former workers at Autumn Grange care home in Nottingham were arrested as part of an investigation into the death of a former resident.
Five men aged between 37 and 77, and six women, aged between 19 and 52 were arrested on suspicion of manslaughter and bailed pending further enquiries, Nottinghamshire Police said.
Ivy Atkin, 86, died on 22nd November last year, just over a fortnight after she and 27 other residents had been moved out of the privately-owned residential home following concerns about standards of care.
In a statement issued at the time, Nottingham City Council said:
The council are undertaking a Serious Case Review to look into the circumstances surrounding Mrs Atkins' death.
"We have since been conducting a safeguarding investigation into issues at the home, in conjunction with the police and the Care Quality Commission and will continue to help the police with their investigation into the death of a former resident", a statement said.
The Care Quality Commission said it had referred the care home to the local authority after receiving calls from a whistleblower.