When the federal judge Claudio Bonadio handed down the 491-page indictment against Ms. Kirchner; her foreign minister, Hector Timerman; her handpicked intelligence chief; her top legal adviser; two pro-Iran activists; and 10 others, he didn’t mince words. He called the attack on the Jewish community center an “act of war” by Iran and accused Ms. Kirchner of covering up the role of senior Iranian leaders and their Hezbollah proxies in exchange for a trade deal.

If only Alberto Nisman were alive to see justice finally being pursued.

Three years ago, Mr. Nisman was set to testify to the country’s Congress on Ms. Kirchner’s role in the cover up. The day before his testimony, on Jan. 18, 2015, he was found dead in his apartment in Buenos Aires, with a bullet in his head. This, despite the fact that he had a 10-man security detail paid to protect him.

Within hours, Ms. Kirchner announced that Mr. Nisman had committed suicide. In the days that followed, she strangely claimed his death was part of a lovers’ spat. Finally, she changed her story once more: His death may have been the result of rogue intelligence operatives.

When we heard the news of Mr. Nisman’s death and of Ms. Kirchner’s suspected cover-up, we were horrified, but not entirely shocked. Anyone who had followed Mr. Nisman’s pursuit of this case knew that he was assuming grave risks by taking on both a terrorist state and his own government. Through a decade of investigation, Mr. Nisman received death threats against not only him but his children as well. One email he told us about had a picture of bloodied and brutalized bodies lying on the ground, with a note saying this would be the fate of his young daughters if he did not cease his investigation.

None of it stopped him. Fearless and resolute, Mr. Nisman and his team had determined that former Iranian and Hezbollah officials planned the AMIA attack. He was able to show definitively that the plan included no less than Iran’s former president, Ali Akbar Hashemi Rafsanjani; its minister of intelligence; its foreign minister; the head of Iran’s Islamic Revolutionary Guard Corps; the head of the corps’ elite Quds force; the Iranian cultural attaché in Argentina; and the third secretary at Iran’s Embassy in Buenos Aires, as well as the former head of Hezbollah’s external security. His investigation led Interpol to issue red notices — akin to international arrest warrants — against six of the perpetrators. Argentina itself issued arrest warrants for Mr. Rafsanjani and Ali Akbar Velayati, then foreign minister, which Iran predictably disregarded.