Australian-Iranian man Shokrollah Jebeli, 83, has died in prison in Iran, ending his family's two-year battle to get him released.
Mr Jebeli was detained in early 2020 and sent to Tehran's notorious Evin prison while facing two separate financial dispute cases, according to Amnesty International.
He was sentenced to four years and six months in one case, while the second was ongoing.
Amnesty said Mr Jebeli was denied the legal representation of his choosing, and the judge presiding over his second case had demanded the removal of his independently chosen lawyer.
Peyman Jebeli, Mr Jebeli's son, has spent the past two years trying to raise money to fund a legal case to bring him back to Australia.
He also used Twitter under the handle @FreeShokrollah to share information about his father's case.
Peyman Jebeli told the ABC he struggled to get help from officials or the community.
"All I want is to bring my father's body back. He was an Australian, a dad, a grandad."
A DFAT spokesperson said officials had consistently advocated for Mr Jebeli's interests and repeatedly sought his release on compassionate and humanitarian grounds.
The spokesperson said DFAT remained in contact with Mr Jebeli's family, and were offering support with funeral or repatriation arrangements, and recovery of personal effects.
Amnesty International Australia campaigner Nikita White had been working to try and release Mr Jebeli.
"The allegations against him were made by someone who claimed to be in the Ministry of Intelligence," she said last year.
"It raises real concerns about the fairness of the allegations against him and the fairness of the trial."
Son had concerns his father was going to die in jail
Ms White said Mr Jebeli's family had not seen any evidence to support the allegations against him.
She said Amnesty had called for him to be released because of his bad health and the poor conditions he was being held in.
Amnesty reported that Mr Jebeli suffered from enlarged kidney stones, had a history of strokes, sciatica in his legs, high blood pressure, and an umbilical hernia.
They also said he had a stroke in 2021 while in prison.
It is not yet known how Mr Jebeli died, but his son told the ABC last year that he had a "serious concern that my father could die in prison".
'Torture' inside notorious jail
Amnesty said Mr Jebeli lived in an overcrowded and insect-infested cell with around 19 other prisoners, sleeping on a mattress on the floor.
Evin prison has became synonymous with torture and death, with thousands of reported hangings, the disappearance of numerous political detainees and an "appalling level of brutality" as detailed in reports by Amnesty International.
Former detainees described windowless cells, air that reeked of "sweat and vomit" and sounds of gunfire and "pain-saturated" screams.
Peyman Jebeli told the ABC last year there were often power and internet outages at the prison, and limited access to doctors and medicine.
Amnesty said the conditions "violate the absolute prohibition of torture or other ill-treatment".
