According Fairfax Media, which owns the Sydney Morning Herald, the Australian Security Intelligence Organisation suspected Zygier of using his Australian passport in order to conduct espionage for Israel.
The Herald said Wednesday that in early 2010 a Fairfax Media reporter had confronted Zygier, who was known in Israel as Ben Alon, about his activities for Mossad. Zygier had angrily denied the allegations, the report said, calling them "total bulls**t." By late 2010, Zygier had apparently hanged himself in his cell at Ayalon high-security prison.