The ABC's Foreign Correspondent program first broke the story of the plight of Australian-born Israeli spy Ben Zygier in February.
Zygier, who was known as Prisoner X during his incarceration, was found hanged in his high-security prison cell near Tel Aviv in late 2010.
The Australian Government has demanded information on Zygier's reported suicide, but Israeli authorities have so far remained tight-lipped.
Look back at the key developments as the story unfolded.
Australian suspected of Mossad links dies in Israeli jail
Evidence has been unearthed that strongly suggests Israel's infamous Prisoner X, who was jailed under extraordinary circumstances in 2010, was Australian national Ben Zygier from Melbourne. .
Family tight-lipped on Israeli Prisoner X case
Zygier's uncle tells the ABC the case is a "tragedy", but would not shed any light on whether his nephew is Israel's infamous Prisoner X. .
DFAT knew of Australian's detention in Israel
Foreign Minister Bob Carr orders a review of the case after confirming his department was made aware in 2010 that an Australian man was being held in a super-secret Israeli jail. .
Israel breaks silence on Prisoner X case
After partially lifting a gag order banning media coverage of the case, Israel confirms it imprisoned a mystery foreigner in solitary confinement, and that the man later committed suicide. .
Doubts over Prisoner X suicide claims
A lawyer working for Zygier met with him in his top secret Israeli jail cell in the days before his death and found no sign he was suicidal. .
Unmasking Prisoner X: Beating the censors
Read how Israel's top spies scrambled to keep the lid on Foreign Correspondent's revelations about Zygier. .
Smith won't reveal what he knew on Prisoner X case
Former foreign minister Stephen Smith refuses to say whether he was briefed on Zygier's plight. .
Israeli PM wants noise turned down on Prisoner X case
Israel's prime minister Benjamin Netanyahu says the country's security forces must be allowed to get on with their work "quietly" in the wake of the Prisoner X case. .
Israel to conduct 'intensive' Prisoner X probe
Israeli officials announce the country's parliament will conduct what it calls an "intensive" inquiry. .
Zygier arrested after leaking Mossad work to ASIO: sources
Sources say Zygier was arrested by his own spymasters after they believed he told Australian intelligence officials about his work with the Israelis. .
Israel denies Zygier had contact with ASIO
Israel denies Zygier had any contact with Australia's security services, as a court backs its government's claim that he hanged himself. .
Prisoner X revelations 'massively damaging Israel'
An Israeli defence specialist says the ABC's revelations about Zygier's death have done extraordinary damage to Israel. .
Carr reveals problems with DFAT's handling of Zygier case
Bob Carr confirms that Zygier worked for the Israeli government, raising the prospect that Australian passports may have been used for foreign intelligence purposes. .
Reports Zygier spilled secrets to Hezbollah
A new report claims Zygier was jailed after mounting a rogue intelligence operation which compromised the identities of two prized Lebanese informants. .
Carr demands answers on Zygier case
Senator Carr says the Government has asked Israel for all information relevant to Zygier's arrest, detention and suicide. .
Israel won't lay charges over Prisoner X death
An Israeli court report has found evidence that negligent prison officials contributed to the death in custody of the alleged Australian-Israeli spy Ben Zygier. .
Zygier sabotaged mission to bring home soldiers' remains
Four Corners reveals that Zygier unwittingly sabotaged a top secret spy operation aimed at bringing home the bodies of Israeli soldiers missing in Lebanon. .