Could Iran Have Killed Argentine Prosecutor Alberto Nisman?

In 2014, Argentine prosecutor Alberto Nisman was murdered in his home during an investigation into who was behind the bombing of the Israeli embassy in Buenos Aires. Having believed to have proof that Iranians collaborated with Argentinians — including complicity of then-President Cristina Kirchner — Nisman was prepared to come forward with his findings. Was Iran, believed to be the culprit of the embassy bombing, behind his murder, too?