Police have now offered a £20,000 reward for information leading to the arrest of the killers:
DCI Steven Lawrence, leading the investigation, said: "The investigation into the murder of Mrs Chung and the linked break-in in Vine Lane on the night of November 6 continues. We know at least three suspects broke into Vine Lane.
"There is a reward of £20,000 for information that will help us prosecute those responsible."
He added: "The local community has been very helpful with our enquiries into these two appalling crimes where victims have been brutally attacked in their own homes.
"But I believe that within the local community of Hayes and West Drayton people have information who have yet to come forward.
It was initially thought that Helen had the restaurant's takings with her when she returned home, but police now know she did not.
Anyone with information is asked to contact the incident room at Belgravia on 020 7321 9251, or call Crimestoppers anonymously on 0800 555 111.
Full story here.