whatever the reason, one year on, these people are asking what happened to alberto nuzman. >> translatort to keep looking for answers. argentina is a world power and looking for justice. >> translator: we all felt nuzman's death. it wasn't just him dying. it was the death of all of argentine. >> reporter: a month after his death these crowds filled the streets of buenos aires, calling for justice. they believe nuzman was killed to silence his investigation. others say he had no case against the president and killed himself. >> translator: his daughters should be the first to benefit from this investigation, but in second place should be the country, because we all need to know what happened to the investigator who denounced the president of the nation. >> reporter: many here hope the change of government will bring fresh impetus to the investigation, an investigation that from the beginning has divided argentina along political lines. one year on, those divisions are as strong as ever. >>> the mayor of the u.s. city struggling to deal with contaminated water supplies is flying to washing

these people are still asking how alberto nuzman died. >> translator: they are trying to cover the sunr hands, but the hands they are using to block out the sun are covered with gun powder and blood. >> reporter: alberto nuzman was due to present his findings. there are those who say because this case is so important and complicated, it needs to be done properly. others say it is highlighted from the inefficiencies in argentine systems. whatever the reason, one year on, these people are asking what happened to alberto nuzman. >> translator: we're looking for justice. >> translator: we all felt his death. it wasn't just him dying. it was the death of all of argentine. i'm confident we'll see change and honor him as he deserved. >> reporter: a month after his death, these crowds filled the streets calling for justice. they believe he was killed to silence his investigation. oirs say he had no case against the president and killed himself. >> translator: his daughters should be the first to benefit from this investigation, but in second place should be the country, because we all need to