Police officers in Essex have drained a pond near the scene where Saudi Arabian student Nahid Almanea was murdered in Colchester last Tuesday and are carrying out an "intensive fingertip search."
The 31-year-old was stabbed 16 times and left to die as she walked along a quiet footpath in the town.
The search came as Detective chief superintendent Steve Worron issued a new appeal for information about a man seen wearing a "distinctive" beige-coloured jacket while walking along the Salary Brook Trail, where Ms Almanea was killed, around the time of the attack.
More top news
A three-year search for Malaysia Airlines flight MH370 has ended without any trace of the aircraft, authorities have announced.
Arthur Hutchinson claims the whole life term amounts to inhumane and degrading treatment, as he has no hope of release.
After a frosty start, southeastern areas will be dry with increasing amounts of sunshine developing. It will remain cold throughout the day.