A 53-year-old man arrested on suspicion of murder in Great Wilbraham has been released with no further action.
Police were called to the sudden death of dentist Dr Helen Nicoll at her home in Frog End, Great Wilbraham, at about 6.30am on Friday.
A post mortem examination later concluded she died as the result of asphyxiation.
The case has now been passed to South and West Cambridgeshire coroner, David Morris, and an inquest is set to be opened and adjourned in Huntingdon tomorrow.
A spokeswoman for Cambridgeshire Police said they were still treating the death as unexplained and further tests and inquiries were being carried out into the circumstances of the death of the 52-year-old mother-of-three.
She was the wife of Harley Street dentist Stephen Nicoll who runs a private practice - Hurst Park Dental in West Chesterton, near Cambridge - as well as specialising in dental implants in Harley Street.
Mrs Nicoll spent two years as a registrar at Addenbrooke’s Hospital in Cambridge before joining the Hurst Park practice in 1990.