Police investigating the murder of a vulnerable woman have made a third arrest.

Eliza Bibby, 47, was found dead at her bungalow in Wisbech on January 10.

A neighbour later said he heard a raised voice the night before disabled Ms Bibby was found by an ambulance crew at her home in Beechwood Road.

Eastern Daily Press: Police search drains on Beechwood Road in Wisbech after the murder of Eliza BibbyPolice search drains on Beechwood Road in Wisbech after the murder of Eliza Bibby (Image: Chris Bishop)

A spokesman for Cambridgeshire police said: "We have made a third arrest in connection with a stabbing in Wisbech in January.

"A man in his 20s from Wisbech was arrested yesterday on suspicion of murder. He has since been released on bail, with restrictions, to appear at Thorpe Wood police station on June 2."

A 45-year-old man who had been arrested on suspicion of the murder was found dead in his cell at Peterborough Prison in January.

Eastern Daily Press: Police in Beechwood Road in Wisbech after Eliza Bibby was murderedPolice in Beechwood Road in Wisbech after Eliza Bibby was murdered (Image: Chris Bishop)

Mark Coleman had been arrested and bailed on suspicion of murdering Ms Bibby but remanded in custody in connection with unrelated allegations regarding a commercial burglary.

Mr Coleman had previously also been questioned over the death of widow Una Crown, 86, who had been found dead in her bungalow on Magazine Lane, Wisbech, in January 2013.

Like Ms Bibby, she died after being stabbed in the neck. Police have declined to comment on any links between the two killings, almost exactly 10 years apart.

Eastern Daily Press: A police officer outside the bungalow in Wisbech where Una Crown was murdered in January, 2013A police officer outside the bungalow in Wisbech where Una Crown was murdered in January, 2013 (Image: Ian Burt)

The Cambridgeshire force faced heavy criticism for its initial handling of the Una Crown case.

At first officers did not think she had been murdered and so the scene was not sealed off, allowing potentially vital evidence to be destroyed.

At an inquest opening, the coroner said the cause of Mr Coleman's death had not yet been ascertained, pending toxicology tests.

A 42-year-old woman from Wisbech has also been arrested and bailed on suspicion of Ms Bibby's murder and remanded in custody in connection with unrelated allegations.