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TEHRAN—The family, clad in black, stood at the curb of the road sobbing. A middle-aged mother slapped her cheeks, letting out piercing wails. The father, a frail man who worked as a doorman at a clinic in central Tehran, wept quietly with his head bowed.

Minutes before, an ambulance had arrived from Tehran's morgue carrying the body of their only son, 19-year-old Kaveh Alipour.

On Saturday, amid the most violent clashes between security forces and protesters, Mr. Alipour was shot in the head as he stood at an intersection in downtown Tehran. He was returning from acting class and a week shy of becoming a groom, his family said.

The details of his death remain unclear. He had been alone. Neighbors and relatives think that he got trapped in the crossfire.

"He was a very polite, shy young man," said Mohamad, a neighbor who has known him since childhood.

When Mr. Alipour didn't return home that night, his parents began to worry. All day, they had heard gunshots ringing in the distance.