It is now highly likely Millerchip's sentencing will be adjourned until early 2014, the statement said.
“At this stage it is unclear if that is directly connected with the assault,” said Detective Chief Inspector Matt Markham, from Coventry CID.
“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.