A mother-of-two from Mold, who was thought to have been assaulted, died of a severe blunt force head injury.
Police are still investigating the death of 48-year-old Sarah Louise Gibbons, who died at Wrexham Maelor Hospital on July 20, three days after being admitted.
At the opening of an inquest at Ruthin, John Gittins, senior coroner for North Wales East and Central, said he had notified the police after medics had raised concern about the cause of her injuries.
A post-mortem examination was carried out by Home Office pathologist Dr Brian Rodgers.
Mrs Gibbons, of Broncoed Park, Mold, was a mother-of-two.
Mr Gittins said police inquiries were “at an advanced stage” but it was not yet known whether they would continue to have an interest in the matter.
The inquest was adjourned to a date to be fixed but the coroner said that would depend on whether any criminal charges were brought.
“I am not necessarily expecting that to happen,” he added.
Last week police arrested a 38-year-old man in connection with the incident but he was later released pending further inquiries.
Sarah's family said in a statement: "We are deeply saddened and shocked at her death. We will be concentrating on supporting Sarah’s two daughters, and we would ask for privacy at this sad time."