Joginder Singh from Canley was admitted to hospital following a brutal attack in Trinity Street on August 10. He was discharged from the hospital and later re-admitted for a diagnosed illness which he was being treated for until his death on Sunday, West Midlands Police said in a statement.
The incident was captured on a mobile phone and sparked outrage online after showing 19-year-old Coral Millerchip kicking out and hitting Singh, knocking him to the ground and causing his turban to fall off.
A post mortem examination was conducted on Monday to establish a cause of death, the statement said.
But the results were inconclusive and further tests will now be conducted over the coming weeks.
Millerchip pleaded guilty to assaulting the pensioner causing him actual bodily harm and was due to appear in court later this month for sentencing.
But due to Singh's death detectives have notified the Crown Prosecution Service (CPS) and will await a decision over what further steps may need to be taken. It is now highly likely Millerchip's sentencing will be adjourned until early 2014, the statement said.
"Our thoughts remain with the family and those affected by Mr Singh's death and we will continue to work with CPS and the coroner to establish the cause of death.
"Specialist family liaison police officers have been appointed to liaise with Mr Singh's next of kin and we will continue to support the family at this sad time," the statement added.
