Australian Jamie Bright has reportedly been killed by Islamic State in Syria where he was fighting alongside Kurdish militia.
Social media accounts tied to the Kurdish group the International Brigade of Rojava claim the Australian died last week in fighting near the IS stronghold of Raqqa.
The Australian Government has not been able to confirm his death.
Gold Coast woman Michelle Harding, who lost her son Reece to a landmine in Syria last year, says sources in the conflict zone have told her of Jamie Bright's death five days ago.
Ms Harding runs a Facebook news page in her son's name, and is very well connected to the Kurdish community in Syria after her son stepped on a landmine and died last year while supporting the Kurdish YPG.
She said Mr Bright, who was aged in his mid-40s, had been in Syria for more than a year, and like her son went there to support YPG efforts to defeat Islamic State militants.
"We were told about it directly from sources that we know there," Ms Harding told AAP on Monday.
"He kept under the radar. He was with the YPG and we heard that he was shot."
In a video recorded in Syria and posted on Facebook, Mr Bright identifies himself as Australian and says he went to the conflict zone to help the Kurdish people defeat Islamic State.
In the video he also gives his Kurdish name as Jabar Ahmet.
"The reason I came to Kurdistan is because of the people, their struggle, their fight," Mr Bright says.
"I've come to help them in any way I can. Minefields, booby traps, demolitions."
AAP has sought comment from the Department of Foreign Affairs and Trade.
The federal government has repeatedly warned Australians not to join the conflict in Syria, stressing they are breaking the law regardless of which side they are fighting for.
