Ali Fazeli Monfared, 20, had requested exemption from military service for his sexuality, according to reports.
But when the letter arrived informing him that he had succeeded, he was not at home – and it was found by ignorant parents.
It is claimed that Mr Monfared’s half-brother and two of their cousins then lured him into a car before committing the brutal murder.
The alleged culprits are said to have left the body under a palm tree in Borumi, a village, before calling her mother with the horror news.
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Sadly, Mr Monfared – known as Alireza – had planned to travel to Turkey to be with his partner just days before his death.
Three men have been arrested in connection with the case and are likely to be charged with murder, according to 6Rang, an Iranian LGBT + organization.
The group said Mr Monfared was killed for his military exemption – which may indicate homosexuality to those responsible.
“Unfortunately, in Alireza’s case, this selection cost her her life,” a statement said.
“Alireza’s mother is, naturally, in shock.
“She is in tremendous grief over the death of her only child and has been hospitalized as a result. “
Mr Monfared last spoke with his mother on the phone on Tuesday, his partner Aghil Abyat told IranWire.
He also led the tributes from dozens of activists and friends who have flocked since the shocking death.
“Nothing is harder than expecting to see someone you love in a few days, and suddenly you hear they’re dead,” he said.
“Nothing is harder than never being able to see him or hear his voice forever.
“It is an excruciating pain that will remain in my heart until the end of time. “
Mr Monfared is said to have had a difficult relationship with his half-brother, who criticized the way he dressed.
Human rights activists have long denounced the discrimination and danger LGBTQ + people face in Iran.
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Homosexuality is punishable by execution in the country.
Many homosexuals are also murdered in “honor killings” perpetrated by their own families, who believe their sexuality is shameful.
Human rights lawyer Gissou Nia tweeted: “RIP Alireza Fazeli Monfared.
“Brutally killed and eliminated by his family because of his sexuality.
“The cultural attitudes of society towards homosexuality are a literal problem of life and death.
“What makes the problem worse is when a state’s laws offer no protection. “
6Rang added in a statement: ” [The] exemption cards are issued by the Islamic Revolutionary Guard Corps.
“Alireza received one indicating that he was homosexual, which is permitted under paragraph 5, article 7 of the military exemption laws.
“The circumstances surrounding Alireza’s murder reaffirm our concerns about the potential dangers of the sexual orientation exemption for young men in Iran.
“This highlights, once again, the need for proactive legislation in this area. “
The Center for Human Rights in Iran added on Twitter: “The despicable murder of 20-year-old Alireza Fazeli-Monfared in Iran – apparently for her sexual orientation – is the result of the Iranian government continuing to perpetuate falsehoods about homosexuality.
“No human being should be discriminated against or harmed because of their sexual orientation. “