The Australian government has stripped Neil Prakash of his citizenship for his affiliation with the Islamic State group.
Prakash is currently in jail in Turkey, where he faces multiple charges related to being a member of IS.
The 27-year-old becomes the 12th dual citizen from Australia to have their citizenship ceased for actions contrary to their allegiance to Australia.
Prakash had his Australian passport revoked and the government has previously attempted to extradite him to Australia from Turkey.
The Turkish government has said Prakash must stand trial and serve any jail time he is sentenced to before being extradited.
Prakash has been held in a maximum-security jail in Gaziantep, in southern Turkey, since he was captured in October 2016 trying to sneak across the border from Syria using fake identity papers.
The self-confessed Islamic State member, also known by the alias Abu Khaled al-Cambodi, was described by former attorney-general George Brandis as “the principal Australian reaching back from the Middle East into Australia”.
According to senior counter-terrorism officials, Prakash was a pivotal figure inspiring and encouraging terrorist plots in Australia.
He appeared in IS propaganda urging attacks in Australia and has been linked by the FBI to a failed plot to attack the Statue of Liberty in New York.
Prakash is the subject of an Australian Federal Police arrest warrant for “membership of a terrorist organisation”, “advocating terrorism”, “providing support to a terrorist organisation” and “incursions into foreign countries with the intention of engaging in hostile activities”.