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A relative of one of Harold Shipman's victims said they should have been informed about the storage and disposal of human tissue.
Suzanne Turner, the granddaughter of Edith Brock, said many families will "feel betrayed" by the police.
Mrs Brock, 74, was murdered by Shipman during a house call he made to her home in November 1995.
Human tissue samples were taken from 12 women killed by Shipman to establish cause of death, it was previously reported.
They were kept in storage for a number of years to ensure that police had the appropriate evidence should the murderer or his family appeal against his conviction.
Assistant Commissioner Jon Stoddart, who is leading the new inquiry into the Hillsborough disaster, said he had informed the families that Mr Sweeney had returned to Greater Manchester Police.
GMP's Chief Constable Sir Peter Fahy said the allegations were serious but pledged that officers would not be distracted from their duty to keep the public safe.
The IPCC said the GMP whistleblower has made a number of allegations including cronyism among senior officers, failure to follow correct procedures, failure to investigate complaints properly and corruption.
Following an IPCC assessment, all other allegations outside of the three investigations have been returned to GMP for the force to deal with.
Officers whose actions will be investigated range from the rank of constable up to GMP’s Assistant Chief Constable, Terry Sweeney.
He was seconded to work on Operation Resolve, the police investigation into the Hillsborough disaster, but has now returned to GMP.
The Independent Police Complaints Commission has launched three investigations into Greater Manchester Police following allegations made by an officer serving in the force.
The three investigations will examine:
- Whether GMP officers misled families and the public when human tissue from victims of serial killer Harold Shipman was disposed
- Claims that an investigation into alleged sexual abuse was poorly handled and the alleged failings covered-up by GMP
- The actions of a Detective Chief Inspector over alleged unauthorised bugging of a GMP office. The force has told the IPCC that this bugging did take place.
Latest ITV News reports
IPCC investigating whether police officers misled families over the disposal of human remains from victims of Harold Shipman.