This. Iran Exonerates Six Who Killed in Islam's Name. Here is an excerpt from the New York Times article.
First, it is OK to kill a man and a woman for walking down a street together? Granted, there is probably more to the story, but even if they were having sex in the middle of the street with donkeys, is death an equitable remedy?. . . According to the Supreme Court’s earlier decision, the killers, who are members of the Basiji Force, volunteer vigilantes favored by the country’s supreme leader, Ayatollah Ali Khamenei, and President Mahmoud Ahmadinejad, considered their victims morally corrupt and, according to Islamic teachings and Iran’s Islamic penal code, their blood could therefore be shed.
The last victims, for example, were a young couple engaged to be married who the killers claimed were walking together in public.
... Iran’s Islamic penal code, which is a parallel system to its civic code, says murder charges can be dropped if the accused can prove the killing was carried out because the victim was morally corrupt.
This is true even if the killer identified the victim mistakenly as corrupt. In that case, the law requires “blood money” to be paid to the family. Every year in Iran, a senior cleric determines the amount of blood money required in such cases. This year it is $40,000 if the victim is a Muslim man, and half that for a Muslim woman or a non-Muslim.
Second, you gotta love the equity in the monetary value of a life. Not all humans are created equal. And somehow, I doubt there are many non-Muslims remaining in Iran at this time.