The Metropolitan Police are offering a £20,000 reward for information leading to the arrest and successful prosecution of the person or people responsible for the murder of Joy Hewer in 1995.
Joy's sister Penny Barnes, and her two nieces will appear on Crimewatch on Monday night along with detectives investigating the case. Penny spoke of the family's long struggle, saying: "We've waited so long for answers, but we'll never give up hope. Someone has evaded us for two decades but this latest appeal with the £20,000 reward could finally help us secure justice for Joy."
Joy, a primary school teacher, was 52-years-old when she was murdered at her home in Walthamstow, north east London. Police were originally called to the address by the London Fire Brigade on 17 October 1995, after reports of a blaze at a sixth floor flat.
Two fires had been started deliberately in her bedroom and lounge. A post mortem examination revealed the cause of death to be multiple injuries, including a number of stab wounds.
Detective Inspector Susan Stanfield, who is leading the investigation, said: "Joy was a much-loved daughter and sister and lived a quiet peaceful life. She must have suffered greatly at the hands of her attacker and we hope this latest appeal, coupled with the significant police reward of £20,000, will urge anyone who can help to contact us."