The police detained the accused on Tuesday morning and handed over the woman's body to her family members after a post-mortem.
Vigya Devi (55) was the sister of an RAS officer posted as a sub-divisional magistrate (SDM) in Jaipur. She was a government teacher and posted in Jaipur collectorate on deputation.
Police have registered a case under section 307 (attempt to murder) of the Indian Penal Code (IPC) in the matter.
The three motorcycle-borne accused pursued the car, stopped it, and opened fire on the bride and the groom and fled away.
The woman was rushed to the hospital where she was declared dead, Kailashdan, SHO, Mahamandir said.
According to the police, the family members found the victim, bleeding profusely, at the roof of the house late on Wednesday night and rushed him to a hospital where he was declared dead.
This is the second such horrific case in the state. Over a fortnight back, a priest was set ablaze in Karauli district over a land dispute.
The incident occurred on Sunday night when Santosh Sharma took his dog outside for a walk and it barked at the accused, Akash Dalal.