The Lincolnshire Police Underwater Search Unit have been looking into a stretch of Sincil Dyke after the victim of robbery in Lincoln has died.
As previously reported, Michael Broxholme (69) was walking home via the garages leading to Hermit Street off Portland Street on June 27 when someone pushed him to the ground and stole his wallet.
He was taken to Lincoln County Hospital to be treated for injuries, however he died in hospital on June 29.
A post mortem examination has been carried out, but further tests are needed to establish the exact cause of his death.
Two men, aged 20 and 23, were arrested on suspicion of robbery shortly after and have since been released on police bail, pending further enquiries.
Meanwhile, the Underwater Search Unit has been continuing investigations into the robbery by searching along Sincil Dyke, around Portland Street and Monson Street on July 8.
Officers investigating the incident are keen to appeal to residents to step forward if they may know anyone or anything regarding the robbery.
Anyone with information on this incident, or who saw any suspicious activity in the area, should call Lincolnshire police or 101, quoting incident number 328 of June 27.
Alternatively, call Crimestoppers anonymously on 0800 555 111.