The victim, Dariush Rezai, 45, was described by the semi-official Iranian Students News Agency as a professional associated with the country's Atomic Energy Organization, which oversees the country's complex of nuclear installations, including uranium enrichment facilities that produce fuel for energy reactors. [...]
In January of 2010, physicist Massoud Ali Mohammadi was killed in bombing carried out by remote control. Later in 2010, a similar motorcycle attack was carried out that killed nuclear scientist Majid Shahriar and injured Fereidoun Abbasi, one of the nuclear program's most renown figures.
Rezai, who reportedly held a doctorate in physics, was reportedly shot by gunmen on a motorcycle outside his home in the southeast of the capital, Tehran, according to the semi-official Mehr News Agency.
UPDATE: Iran is now saying that the victim in Saturday's attack was a university student, not an atomic physicist as earlier reported. Apparently a mix-up over the name of the victim led to the confusion.
UPDATE 2: And the plot thickens. The Associated Press has now confirmed that Rezai was involved in developing high-voltage switches, a key component needed to trigger a nuclear warhead, and a reviewed abstract co-authored by Rezai supports the claim.