The Federal Government has not notified the family of a Sudanese refugee who died in hospital on Christmas Eve after suffering a seizure inside the Manus Island detention centre, a refugee advocate says.

Key points: Faysal Ahmed died on Saturday in a Brisbane hospital after being transferred off Manus Island

Faysal Ahmed died on Saturday in a Brisbane hospital after being transferred off Manus Island Mr Ahmed's family has reportedly not been notified of his death

Mr Ahmed's family has reportedly not been notified of his death Records indicate Mr Ahmed complained that an injury he sustained within the detention centre, weeks prior to his death, had not been taken seriously

Faysal Ishak Ahmed, 27, was evacuated from Manus Island to Brisbane but on Saturday became the fourth refugee detained on the island to die.

Refugees inside the Manus detention centre held a vigil for him on Christmas night.

A spokeswoman for Immigration Minister Peter Dutton said the Government would be making no further comment on Mr Ahmed's death.

The Manus Island ID card of Sudanese refugee Faysal Ishak Ahmed. ( Supplied: Ian Rintoul )

But Ian Rintoul from the Refugee Action Coalition (RAC) said he knew for certain Australian authorities had not spoken to Mr Ahmed's family.

"Why don't they pick up the phone and talk to Faysal's family?" Mr Rintoul said.

"That in itself is a disgrace and says a lot for the kind of contempt they have for people who are their responsibility.

"We get the hypocrisy from the Government about the concerns about safety of lives at sea. They have got no concern for lives they have responsibility for on Manus Island."

He said Mr Ahmed's death showed Australian Border Force had not changed its practices, despite shortcomings in health management on Manus that had come to light in the ongoing inquest into the 2014 death of Hamid Khazaei.

Mr Khazaei, 24, died in a Brisbane hospital several weeks after a leg wound suffered inside the Manus centre became infected with a rare bacteria found in soil and stagnant water.

RAC also released a series of letters from the Manus Island medical provider, International Health and Medical Services (IHMS), responding to Mr Ahmed's complaints over a period of several months that his illness was not being taken seriously.

The complaints prompted 60 Sudanese detainees to write to IHMS calling for urgent action to address Mr Ahmed's ill health.

A banner displayed at the Manus Island vigil for Faysal Ahmed. ( Supplied: Ian Rintoul )

The letter was dated December 21, one day before the seizure that led to the 27-year-old's death.

In that letter, also obtained by the ABC, IHMS was told Mr Ahmed's condition was "getting worse and worse day by day".

Mr Rintoul said the letters showed Mr Ahmed should have taken off Manus Island for medical treatment several months ago.

"He clearly should have got proper medical attention, so the responsibility for his death I think does lie with IHMS and the immigration department," Mr Rintoul said.

"It's clear from their responses that they said there would be a written response which never arrived.

"At one point they suggest he has an appointment with an ear, nose and throat specialist, which clearly indicates they've got some concerns to make that referral.

"But they don't know when that appointment is going to take place and say 'good luck if the symptoms persist'.

"It is not the kind of treatment that someone would get in Australia. It is the kind of treatment that has been systematically dished out to people in the detention centres because there is a culture of dismissal which has been clearly exposed by the inquest into Hamid Khazaei."