Argentina suspects rogue agents from its own intelligence services were behind the death of a state prosecutor investigating the deadly 1994 bombing of a Jewish community center in Buenos Aires.
Alberto Nisman was found dead in his apartment late Sunday, a gunshot wound to his head and a .22-caliber pistol by his side along with a single shell casing.
He had been scheduled to appear before Congress on Monday to answer questions about his allegation that President Cristina Fernandez conspired to derail his investigation of the attack.
His death and a blizzard of conspiracy theories around it have rocked Argentina.
The government said Nisman's allegations and his death were linked to a power struggle at Argentina's intelligence agency and agents who had recently been fired.
It said they deliberately misled Nisman and might have had a hand in writing parts of his 350-page complaint.
"When he was alive, they needed him to present the charges against the president. Then, undoubtedly, it was useful to have him dead," the president's chief of staff, Anibal Fernandez, said Friday.
Iranian group suspected
Argentine courts have accused a group of Iranians of planting the 1994 bomb, which killed 85 people.
Nisman claimed last week that Fernandez opened a secret back channel to Iran to cover up Tehran's alleged involvement in the bombing and gain access to Iranian oil needed to help close Argentina's $7 billion-per-year energy deficit.
Fernandez's government called the accusation absurd. Iran has repeatedly denied any link to the bomb attack.
The Argentine government's chief of staff said Friday that he didn't believe Nisman even wrote his own report.
"I have worked quite a bit with prosecutor Nisman. I know he was a well-qualified expert in the law. He could not have written this nonsense," he said. "It is totally clear he had nothing to do with it, but there were people around him who had a different agenda."
Although the government said there was a conspiracy to falsely accuse the president and then do away with Nisman, no one has been arrested in the case so far.
Officials initially said Nisman's death looked like suicide, but the lead investigator said it was suspicious and that all leads were being followed.
Intelligence chief replaced
The head of Argentine intelligence was replaced in December, resulting in the firing of agents who had been helping with Nisman's investigation. Nisman had accused agents from another faction within the state intelligence apparatus of being part of Fernandez's alleged plot to clear the Iranian suspects.
One of those fired in the December shakeup was Antonio Stiusso, a senior spy who had helped Nisman with the probe.
The government said Stiusso falsely told Nisman that two men implicated in the case against the president were state intelligence agents. Wiretapped phone conversations of the two were key to Nisman's accusation that the government was trying to whitewash the 1994 car bombing.
Fernandez said Thursday that she did not believe Nisman took his own life.
"Nisman's accusation never was, in itself, the true operation against the government. ... The true operation against the government was his death, after accusing the government," she said in a post on Facebook.
Those close to the late prosecutor have doubted from the beginning that he killed himself. Friends described him as upbeat ahead of his scheduled appearance before Congress on Monday.
