The worker was found dead by police on December 28 in Moorooka,in Brisbane’s south,hours after he left the Salisbury site about 1pm.
It was understood the worker,Daniel Sa’u,29,was a father and lived in Zillmere. Authorities said it was unclear at this stage what had caused his death.
CFMEU state secretary Michael Ravbar said Cross River Rail workers had laboured through oppressive heat and humidity over the Christmas and new year break.
“One labourer – a young father – tragically passed away in late December after showing signs of severe heat stress while working on a Cross River Rail site in Salisbury,” he said.
It was understood Sa’u received text messages from his colleagues in the hours after he left the site asking if he was okay.
An online fundraiser launched for the Sa’u family read:“This is an unimaginable loss and the pain of that afternoon leaves us all speechless and in disbelief.”