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The only child of Harvey and Jeannette Crewe says crucial mistakes and missed opportunities made by police mean her parents' murders may never be solved.

The policeman found to have planted evidence that led to the wrongful conviction of Arthur Allan Thomas for the murders of Harvey and Jeannette Crewe has died.

The Independent Police Conduct Authority has received two complaints about the nation's second-highest-ranking police officer, Mike Bush - but it will not be taking any action.

John Key says he's looking into Rochelle Crewe's request for an independent inquiry into her parents' murders.

The criminal justice system is based on the belief that the State punishes only those whose guilt has been proven "beyond reasonable doubt".

In the family's first ever interview, the daughters of a police officer involved in the Crewe murder case say their father would never have planted evidence.

Detectives reviewing the Crewe homicide case received fresh testimony from a world expert who said the abandoned toddler was fed in the five days before being found.