The salary of a prosecutor is about 20.000 pesos.
He was living in an appartment that cost over half a million usd and 45.000 pesos rent.
He was too close with the former head of the SI (intellegence service) that is in war with the President. Stiusso was responsible of the contacts with CIA and Mossad.
Wikileaks shows that Stiusso was more like an employed of the Mossad and CIA while Nisman behaved like and employed of Stiusso and both embassys, imo, and employed of Mossad and CIA.
He was playing a dangerous game with dangerous players. Of course he finished dead.
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