Daryush Rezaee-Nejad, 35, who died Saturday, July 23, when two motorcyclists shot him in the head and throat in front of his home in Tehran, was a rising star of the new generation of Iranian nuclear scientists. DEBKAfile's Iranian sources disclose he was attached to one of the most secret teams of Iran's nuclear program, employed by the defense ministry to construct detonators for the nuclear bomb and warhead already in advanced stages of development.