The family of an Aussie tourist who died in Bali have lashed out after discovering his heart had been removed before his incomplete body was sent home.

Byron Haddow, a 23-year-old FIFO worker, was found floating unconscious in a pool inside a private villa on May 26.

The Noosa man's remains were sent back to Australia four weeks later, but it was only after a second autopsy in Queensland that his heart was found to be missing.

Mr Haddow's parents, Robert and Chantal, are now demanding answers from Indonesian authorities about what happened to their son.

His parents have experienced 'delay after delay' in their repeated attempts to find out how Mr Haddow died and why his heart was removed.

Indonesian police only became aware of the death four days after Mr Haddow died, and by the time officers attended his villa, the scene had been contaminated.

The Coroner in Bali has described the death as suspicious, and the cause of death listed on his death certificate was drowning.

However, Mr Haddow himself was 178cm tall and the pool he supposedly drowned in was only 150cm deep, adding to his parents' concerns about what really happened.

Byron Haddow, 23, was found floating unconscious in a pool inside a private villa in Bali on May 26.

Ms Haddow said the treatment of her son following his death has been 'inhumane'.

'His body was only returned nearly four weeks after his death,' she told news.com.au.

'But two days before his funeral, we were told by the Queensland Coroner his heart had been taken and left behind in Bali -- without our knowledge, without our consent, without any legal or moral justification. This is inhumane. This is devastating beyond words.

'We had a small amount of relief when we finally got our son back to Australia. We thought at least we could say goodbye to him and lay him to rest.

'But then to learn they'd taken his heart and that no one else knew, not even the consulate in Bali, it was a big shock.'

Cuts and bruises were found all over Mr Haddow and blood was also discovered on towels used to wrap his body in Bali.

He was taken to the BIMC private hospital before his body was delivered to the Bali Funeral Home to prepare it for repatriation to Brisbane.

An initial autopsy was performed in Ngurah General Hospital in Denpasar at the request of his family, who suspected foul play.

In emails arranging the autopsy, his parents wrote that following the procedure 'we want his entire body sent home'.

The FIFO worker had his heart removed during an autopsy in Bali and his body was returned to Australia months before his family were able to recover the heart

Forensic medicine specialist Dr Nola Margaret Gunawan received the body and autopsy request on May 30, but the operation was delayed by four days.

This was due to Mr Haddow's body needing to thaw out after being frozen at the funeral home.

Dr Gunawan received a second request from Bali's provincial police for a forensic autopsy to be performed during those four days, and the autopsy was carried out in accordance with Indonesian law.

Forensic autopsies seek to identify the cause and manner of death for legal proceedings in suspicious, violent or unexplained cases.

During these kinds of autopsies, it is common for doctors to remove vital organs like the heart or brain for further study.

Dr Gunawan said pathologists are required to prioritise forensic autopsies.

She said that she did not see the Haddows' email requesting their son's 'entire body' be sent home before his autopsy.

Even if she had seen the email ,she would have still removed his organs, she added.

'Let me explain why. For a clinical autopsy, consent is required from the next of kin to retain organs. But for a forensic autopsy, according to Indonesian Criminal Procedure Code, consent is not required,' Dr Gunawan said.

The results of Dr Gunawan's autopsy revealed Mr Haddow was probably killed by a lethal combination of alcohol intoxication and an antidepressant called Duloxetine.

'I wasn't able to conclude whether it was an accident, suicide or homicide,' she said.

Dr Gunawan also could not explain the many scars and bruises found on his body.

Mr Haddow's heart was returned to Australia several months after his death after he had already had his funeral.

His parents were required to pay an additional $700 to have it repatriated.

The death is now the subject of an open coronial investigation, but The Coroners Court of Queensland has not yet released any information regarding its findings.

Family make horrifying discovery after Aussie dies in Bali