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29 June 2011, 12:57 | Updated: 29 June 2011, 13:13
Two months after a family of four were found stabbed to death at their home, police have made a fresh appeal for help to catch their killer.
Jeff and Helen Ding and their two daughters were murdered at their home in Wootton, Northampton on the royal wedding day, Friday 29 April 2011. Their bodies were discovered two days later.
Detectives are trying to find people who saw 52 year old businessman Anxiang Du (right), who's suspected of killing the family. He had been a business associate of the Dings which had reached a climax in the week of the murders.
Police want to hear from anyone who saw Anxiang Du, or the Ding family's hire car, which was taken by Du and left on a street in St John's Wood in London on Saturday 30 April.
In a statement, Northamptonshire Police say: "We now know that the murders took place on the afternoon of the Royal Wedding, Friday 29 April. Many people will be able to remember where they were that day, at a Bar-b-que, travelling to visit family, a day out for the bank holiday?
"Did you see Anxiang Du or the car he was travelling in, a silver Vauxhall corsa registration BG60 PMO between the hours of 4pm and 9.45pm when the car was caught on CCTV at Rothersthorpe Service Station. It is most likely that Anxiang Du stayed in or around Northamptonshire for this period of time, did you see him?"
"The community has already helped the investigation with a member of public who had seen the media coverage coming across the car a week later in Venables Street, Westminster. CCTV places Mr Du at this location at 2.27am Saturday 30 April. Where did he go next? Where is he now?"
Detective Superintendent Glyn Timmins said "We are very pleased that members of the Ding family are going to visit Northamptonshire in July and we will be talking them through the full police investigation.
"We still have a large team of people working on this and can say with confidence that we are leaving no stone unturned. I personally would like to be able to share further progress on the investigation with the family when they visit – and we need the public's help to do this."
A £10,000 reward has been put up by Crimestoppers for anyone with information which leads to the arrest and conviction of the person responsible for these terrible murders. To claim, you have to contact Crimestoppers directly on 0800 555 111 quoting the reference Operation Nene. Crimestoppers is an independent charity and callers are guaranteed their anonymity.
Mr Du is 52 years old, 5ft 9ins tall and of slim build. He has thinning hair and regularly wears a baseball cap to cover his head.
Anyone with information can also call Northamptonshire Police's incident room for Operation Nene on 0800 096 1011 or 0207 158 0126.