WA Corrective Services say the man was found 'unresponsive' in his prison cell at Casuarina Prison around 9:30pm on Wednesday night.
Prison officers who performed CPR and ambulance officers who were called to the prison were unable to revive the 31-year-old man.
WA Corrective Services Commissioner, James McMahon confirmed the death of the man and said he was found during a routine check.
"The Department has a duty of care to protect prisoners and offenders from harm or injury," he said in a statement.
"The loss of a life in custody or in the community is tragic. I offer my sincere condolences to the man’s family and friends in their grief."
"I also recognise the significant distress this will have on the dedicated staff at Casuarina Prison and across the corrective services system, and in the wider Aboriginal community."
"All deaths in custody are subject to a coronial inquest to determine the circumstances and cause of death."
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