BUENOS AIRES - Investigators into the mysterious death of Argentine prosecutor Alberto Nisman just days after he made serious allegations against the president have called for a former top spy to testify in the case on Thursday, a news agency reported.Nisman was found dead in his apartment just over two weeks ago, with a gunshot wound to the head, the day before he was to testify in Congress about his accusations that President Cristina Fernandez tried to derail his probe into a deadly 1994 bombing of a Jewish community center.It remains unclear whether Nisman committed suicide or was murdered. His death has rocked Argentina, sparking a myriad of conspiracy theories.The government says Nisman's allegations and his death were linked to a power struggle at Argentina's intelligence agency and agents who had recently been fired.
