Alberto Nisman was found dead of a gunshot to the head in his home Sunday, the day before he was to go before a congressional hearing to accuse President Cristina Kirchner of a cover-up. A judge, meanwhile, released the 280-page complaint Nisman had filed before his death charging that Kirchner had issued an “express directive” to shield a group of Iranian suspects in the 1994 Jewish community center bombing. A van loaded with explosives destroyed the Buenos Aires headquarters of the Argentine Israelite Mutual Association, or AMIA, killing 84 people and injuring more than 300 in Argentina’s worst ever attack.