The Metropolitan Police has offered a reward of up to £20,000 for information to help solve the murder of a Lithuanian man in December.
The body of 34 year-old Evaldas Svolkinas was found in a stream in Romford - he had died from severe head injuries.
Police believe Mr Svolkinas was carrying a rucksack when he was attacked but the bag is yet to be traced. He was also a frequent gambler who owed money to several people. Detectives are asking members of the Lithuanian community with information about his life to come forward.
Anyone with information can contact the incident room on 020 8345 3734 or Crimestoppers anonymously on 0800 555 111.