Moreover, Argentine Foreign Minister Héctor Timerman said, he has no knowledge of what happened to the prosecutor found shot to death the night before he was to present allegations of the secret deal to lawmakers. And the foreign minister expressed deep reservations about the possibility of U.S. assistance in determining how prosecutor Alberto Nisman died — despite calls by some Argentine and U.S. legislators for the FBI to help investigate and an offer of help from the U.S. government.