Ruth Hudson, the solicitor acting on behalf of Mr Kehazaei's family in Iran, said his shattered mother and brother were demanding to know why his life had been lost to a treatable infection.

Ms Hudson said that by the time Mr Kehazaei, a Manus Island detainee, was transferred from a Port Moresby hospital to the Mater Hospital in Brisbane, he was already "gravely ill".

Immigration Minister Scott Morrison confirmed the asylum seeker's death on Friday night in Brisbane's Mater Hospital, where he had been on life support for a week.

Mr Morrison said there would be a review into the death and he would also request a medical review from the health service provider on Manus Island, International Health Medical Service.

Ms Hudson said on Saturday that any review had to be independent to ensure a proper investigation.

"They [Mr Kehazaei's family] have just said to me they want justice," she said.

"They want answers.

"They want to know why their son has died of a non-threatening health condition while in Australian care because this just doesn't happen in a civilised country."

Ms Hudson said no medical records had been supplied yet to show the chain of events before Mr Kehazaei's transfer from Manus Island.

She said three problems with the medical care he received could have contributed to his death.

The first was an inadequate initial diagnosis on Manus Island, where it was still unclear when Mr Kehazaei had first complained of symptoms after sustaining a leg wound.

The second was that authorities took too long to transfer the asylum seeker after his case was deemed an emergency.

Ms Hudson said a recommendation was made around August 25 to urgently transfer Mr Kehazaei, but he was not transferred to the Pacific International Private Hospital in Port Moresby until the following day and it was a day later before he was sent to Brisbane.

"I understand that by the time he reached Mater Hospital, he was beyond a critical condition," she said.

Ms Hudson said the final concern was with conditions on the island and inadequate treatment both in the initial stages of the infection and through the course of his transfers.

"We want to make sure any review is independent and open because that is the only way that justice can be done," she said.

The Labor Party said on Saturday the government had to commit to making all information on Mr Kehazaei's case available, given a fairly minor injury appeared to have led to his death.

"The family and friends of Mr Kehazaei deserve to know he was afforded proper healthcare at every step," immigration spokesman Richard Marles said.