A close friend of a family stabbed to death in their home has criticised detectives saying more should have been done to catch their killer.
The Ding family from Northampton were murdered in April last year - on the day of the Royal Wedding. The prime suspect An Xiang Du is still on the run.
In his first television interview with ITV's Neil Bradford, Paul Delaney has accused detectives of losing their focus. He says he’s been frozen out of the investigation.
Northamptonshire detectives have just returned from China, where they met Chinese law enforcement officials and relatives of the Dings and associates of the suspect.
Mr Delaney says the trip should have been made sooner and accuses police of losing focus.
Northamptonshire Police refused to comment directly on Mr Delaney’s criticisms. Detective Chief Inspector Tom Davies, leading the investigation, said: “We have an experienced and dedicated team of officers working tirelessly to bring justice to the Ding family. We have pursued extensive lines of enquiry and this trip to China was timely as we approach the anniversary of the murders and served to fulfil a number of aims for the investigation.