Gold Coast man Patrick Stevenson, 20, has been detained for seven months in Syria over the shooting death of another Australian man Abdullah Glen Charles Burgess in December.
The penalty for pre-meditated murder in Syria is punishable by death.
However, Â Mr Stevenson could be spared execution under Syria's legal system if Mr Burgess's widow grants forgiveness in the form of a blood-money payment.
Mr Stevenson travelled to Syria in 2025 after becoming radicalised while living on the Gold Coast, the ABC reported.
Prime Minister Anthony Albanese said the federal government was providing assistance to both families.
"Legal processes will take their course overseas, of course, and that is appropriate," he told ABC TV on Thursday.
"I feel for the families of the person who's lost their life, and we've connected with them and providing support for them.
"We're also providing support for the family of the person who's been charged."
Australia does not have a diplomatic presence in Syria, which has limited the ability for consular support.
The Department of Foreign Affairs and Trade has been approached for comment.
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