The suspect, 65, was also arrested on suspicion of causing or allowing death or serious injury to a vulnerable adult.

It comes after a woman from Oxford was found dead at an address in Ridgeway Road, Headington, on November 22.

An investigation was launched by Thames Valley Police after the force received information that "raised concerns".

Officers executed a warrant on Saturday (December 9) at an address in Ridgeway Road and arrested the man.

He has since been released on bail.

There was still a police presence at the scene on Monday night with three officers seen chatting to nearby residents.

Neighbours said it was a shock that a ‘murder’ could have taken place on a quiet street where many houses are adorned with Christmas decorations.

One man, who asked not be identified, told the Oxford Mail: “There have been police cars about the street all day.

“You don’t expect something like this to happen in a quiet street but you’re not surprised these days with how the world is going.

“There are so many murders happening in the UK – especially in Oxford recently.

“I’m saddened and surprised really.”

Another described the woman who died as “really nice”.

A police spokesperson said: “Our Major Crime Unit is investigating an unexplained death in Oxford.

“At around 10pm on 22 November, South Central Ambulance Service informed us about the sad death of a 63-year-old woman from Oxford at an address in Ridgeway Road, Headington.

“On Wednesday (December 6), police received information that raised concerns and an investigation into the death was launched.

“As part of the investigation, officers executed a warrant at an address in Ridgeway Road on Saturday and arrested a 65-year-old man from Oxford on suspicion of murder and causing or allowing death or serious injury to a vulnerable adult.

“He has been released on police bail until 29 February next year.

“We are not looking for anyone else at this stage.

“There is still a police presence at the address and the investigation is ongoing.

“A Home Office post-mortem examination was completed today (11/12) but it was not possible to ascertain a cause of death and further investigation is required.

“The woman’s next of kin were informed and are being supported by specially trained officers. Our thoughts are with them at this extremely difficult time.

“While there is nothing to suggest any threat to the wider public, we appreciate this may be concerning so anyone with concerns should speak to one of our uniformed officers or contact us.“

“Anyone with any information about the death should call 101 or make a report on our website, quoting reference number 43230526245.

“Alternatively, provide information anonymously to independent charity Crimestoppers by calling 0800 555 111 or via its website.”