"Dadu suddenly took ill on Wednesday and was receiving treatment at the Jinnah Postgraduate Medical Centre when he passed away," Shunail Shah, the assistant superintendent of police at Malir jail, said.
Shah confirmed that Dadu had completed his jail sentence when he passed away.
"He had been in jail since last November and was anxiously awaiting his release. We are also shocked because he was a very energetic person and was in high spirits when he fell ill," the police official said.
"He had completed his prison term and was only awaiting release orders," the Assistant Superintendent of Police at the jail, Shunail H Shah, said. "He was looking forward to going back to India and reuniting with his family.
"Doctors at the JMC said that the Indian prisoner was brought to the hospital complaining of low blood pressure and high fever. "He was treated in the emergency ward but passed away on Thursday morning," one doctor said.
"The cause of death is hypotension and cardiopulmonary failure," he said. Officials said Dadu's body had been shifted to the Edhi trust morgue and they were awaiting further orders from the Indian embassy officials.
"The authorities here cannot conduct a postmortem unless we get permission from the Indian embassy," the ASP said. The dead body of the Indian fisherman could not be shifted from Pakistan due to lengthy procedures about autopsies of imprisoned citizens dying in the rival country.
Spokesman of the Indian high commission told PTI on Friday that the body will be flown home after its post-mortem which will be performed after Pakistan officially conveyed about the incident to the Indian diplomats.
"So far we have not been formally informed about it," the spokesman said.