His father, Yousef, first called his fiancée and friends. No one had heard from him.

At the crack of dawn, his father began searching at police stations, then hospitals and then the morgue.

Upon learning of his son's death, the elder Mr. Alipour was told the family had to pay an equivalent of $3,000 as a "bullet fee""a fee for the bullet used by security forces"before taking the body back, relatives said.

Mr. Alipour told officials that his entire possessions wouldn't amount to $3,000, arguing they should waive the fee because he is a veteran of the Iran-Iraq war. According to relatives, morgue officials finally agreed, but demanded that the family do no funeral or burial in Tehran. Kaveh Alipour's body was quietly transported to the city of Rasht, where there is family.

"He was so full of life. He had so many dreams," said Arsalan, a taxi driver who has known the family for 10 years. "What did he die for?"

Write to Farnaz Fassihi at farnaz.fassihi@wsj.com