Ding murders: New footage in Crimewatch appeal
CCTV footage taken in London of a man police suspect of killing four members of a family in Northampton is to be released in a new appeal.
Jifeng Ding, his wife Helen and their two daughters, Alice, 12, and Xing, 18, were found stabbed to death at their home in Wootton on 1 May.
The Dings' business partner Anxiang Du, from Coventry, is the prime suspect but has not been seen since May.
The new CCTV footage will be shown on the BBC's Crimewatch on Thursday.
It shows the businessman abandoning his car at 02:27 BST on 30 April in Venables Street, off Edgware Road, in central London.
'Move investigation forward'
It was the last confirmed sighting of the 52-year-old, who is a previous business associate of Mr and Mrs Ding.
Mr Du, who worked at a herbal medicine shop in Birmingham, went missing a day after losing what has been described as a bitter court battle over his shared business interests with the Ding family.
Det Supt Glyn Timmins said: "I'd ask the public to contact us with information, however limited they feel it is, which can tell us where Anxiang Du is, where he has been or anything to do with the circumstances leading up to this terrible crime.
"It sometimes only takes a small piece of information to significantly move an investigation forward and I am very hopeful that Crimewatch can prompt someone who knows where Anxiang Du is to contact us."
Crimestoppers has previously offered a reward of £10,000 for anyone with information which leads to the arrest and conviction of the person responsible for the murders.