There is a growing suspicion that Argentina prosecutor Alberto Nisman did not take his own life, but rather was assassinated by a person or persons unknown.

Nisman was prepared to testify at a congressional hearing on a government coverup of Iranian involvement in the 1994 bombing of a Jewish community center in Buenos Aires. After unsuccessfully trying to call him Sunday night, his body guards called his mother who had a key to the prosecutor's apartment. When the key wouldn't workl, a locksmith was called, who was able to open the door. Nisman was found in the bathroom with a single gun shot to his head.

But the locksmith told the press that there was another entrance to the apartment apparently left ope.

Telegraph:

Walter said the main entrance was locked, but that the service door was "open" and not closed with the usual security measures.

He told reporters outside the offices of Viviana Fein, investigating the case: "The service door was open. I put the key in and opened it. It took two minutes."

He was asked whether only a locksmith could have opened it. "No, anyone could have done," he said.

"The mother watched me. With her key, I made a movement and opened it. It took me longer to arrange all my tools than it did to open the door - ten minutes from beginning to end.

"The key was in it. So I had to lift the key a little, push it, and then it opened."

Could a person have exited via that door, and simply closed it, he was asked? "That is for you to work out," he replied.

Argentine newspaper Clarin reported on Wednesday the existence of a secret third entrance to the flat - publishing photographs of a small metallic door which gave access to the apartment.

The third door linked Mr Nisman's flat to a neighbouring apartment, which was rented by a foreign national - not thought to be Iranian. Clarin said that in the narrow corridor between the two doors, blocked by an air conditioning unit, police had found a fingerprint and a footprint.

[...]

The previous day he had borrowed the gun from a colleague, Diego Lagomarsino, 35, who delivered the weapon to Mr Nisman and was the last person to see him alive. Mr Lagomarsino, who went straight to the police on hearing of Mr Nisman's death, has reportedly said that Mr Nisman asked to borrow the gun for protection.

His death sent a political tremor through Argentina, and let to a series of spontaneous protests across the country demanding for justice for Mr Nisman.

His ex-wife, Sandra Arroyo, a judge, said her husband would not have committed suicide. Ms Fein, the investigator, said that there were no traces of gunpowder on his right hand - although that was inconclusive. And Mr Nisman's friends have all been quick to say that he was excited by the opportunity to present his case - the fruit of over a decade of investigation.

The locksmith's statement loses something in translation. It took two minutes. It took ten minutes. Was he talking about the main door or the service door? And that's two doors, but there was a third door as well?

Regardless, the existence of a service door that was apparently open raises serious questions about the official cause of death being suicide. But why did Nisman, after all these months - and a week after he had made his initial charges against the government - finally ask for a gun for protection? Where were the guards? How could the assassin exit unseen?

Obviously, with so many unanswered questions - and with each new revelation pointing the finger at the government - this case is not going to fade away anytime soon.