Police have launched a fresh appeal to help solve one of County Durham most infamous murder cases.

Durham Police have launched an appeal to help find the killer of Ann Heron, who was found dead at her Aeolian House home on the A67 in Darlington 33 years ago today (Thursday, August 3) .

The mother-of-three had been sunbathing in her garden in the afternoon of Friday, August 3, 1990, before being found at 6pm in her living room lying in a pool of blood.

Despite a several years-long police investigation, the 44-year-old's killer has never been found.

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Detective Chief Inspector Craig Rudd, of Durham Constabulary’s Major Crime Team, said: “The investigation into the murder of Ann Heron remains open.

“The Major Crime Team continues to review the case and investigate any new information using advances in forensic science in the hope of identifying evidence to prove who is responsible.

“I hope this appeal on the 33-year anniversary of Ann Heron’s murder will jog someone’s memory and they come forward with any information they may have.

“Ann’s family have been left devasted by what happened, they deserve closure, and we will never give up trying to find who killed her.”

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Detectives are continuing to use advances in forensic technology to review items recovered from her home.

They also review all information that is submitted by members of the public and urge anyone who might know something from that day, however insignificant they think it might be, to get in touch.

Ann’s son Ralph Cockburn added: “My sister Ann Marie and I want to express our gratitude to those who have already come forward with information.

“Your co-operation has been incredibly valuable, and we’ve made progress thanks to you. But we’re not there yet; we need your help to complete the picture. 

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“I know there are people out there who know something about what happened that day. You might think that the info you have is insignificant, but trust me, even the smallest detail could be a game-changer.

“It might just be that missing puzzle piece we need to finally catch our mum’s killer.”

Information can be reported to Durham Constabulary via 101, anonymously via Crimestoppers on 0800 555 111, or via the portal here.