Mohammad Mahdi Karami’s family pleaded with authorities to spare his life.
Two men have been hanged in Iran for killing a member of the security forces during nationwide protests against the government last year.
Mohammad Mahdi Karami and Seyed Mohammad Hosseini had appealed against their sentences, saying they had been tortured into making false confessions.
The two men executed on Saturday had been convicted over the death of a member of the Basij paramilitary force militia, who prosecutors said was stripped naked and killed by a group of mourners who had been paying tribute to a slain protester, Hadis Najafi. Three others have been sentenced to death in the same case, while 11 received prison sentences.
The family of 22-year-old Mr Karami say they were not permitted to meet him before he was killed on Saturday. They had also pleaded with the judiciary to spare his life. “I beg you please, I ask you… to remove the death penalty from my son’s case,” his father said.