Detectives investigating the robbery and death of Michael Broxholme in Lincoln are appealing for two teenage girls, who are believed to have helped him, to come forward.
Mr Broxholme, 69, was pushed to the ground and robbed during the early evening of Friday, June 27.
He was taken to Lincoln County Hospital but sadly died the following evening.
DCI Nikki Mayo, who is the Senior Investigating Officer in the enquiry, said: “We believe that two teenage girls went to Mr Broxholme’s aid after the incident.
“We would very much like to hear from them and talk to them to see if they have any information that could assist with the enquiry.
“I would like to appeal directly to them both to contact us because the information they have could help us build up a bigger picture of what happened to Mr Broxholme.
“We also believe that a woman, possibly the mother of one of the girls, was on her way to pick them both up. We would also like to talk to her to see if she can help.
“Please contact Lincolnshire Police on 101 because the information you have could prove vital to the investigation.”
A post mortem exam has been carried out but further tests are needed to establish the exact cause of Mr Broxholme’s death.
Officers say at this stage it is not possible to say whether any injuries he sustained as a result of the robbery were linked to his subsequent death.
Anyone who has any information about the incident, or who saw or witnessed anything to do with it, is asked to contact Lincolnshire Police on 101 quoting incident 328 of June 27.
Alternatively contact the independent charity Crimestoppers anonymously on 0800 555 111.