More tests over Jacqueline Hansen Walton-on-Thames death
Further toxicology tests are being carried out after a 56-year-old woman died in Walton-on-Thames this summer.
Surrey Police said work was still under way to find the cause of Jacqueline Hansen's death after post-mortem tests in June were inconclusive.
A man arrested on suspicion of murder was told he would face no further action this month, but the inquiry into the death is continuing, officers said.
The force has found no evidence of third-party involvement.
Surrey Police have also been investigating the actions taken by officers and staff after they first received reports concerning Ms Hansen's safety.
Her body was found at her house in Trafalgar Drive on 11 June after police forced their way into the property.
The case was referred to the Independent Police Complaints Commission (IPCC) at the time, but was then referred back to the force.
A spokeswoman for the force said the internal investigation was also still ongoing.