Amit Chaturvedi (21), a relative of the bride's family was killed in the incident that took place yesterday during the marriage function, they said.
According to police, bride's brother Monu fired several rounds of shots from the licensed revolver of his father Deepak Chaturvedi.
One stray shot hit Amit, leaving him seriously injured, police said, adding, he was rushed to the hospital where he succumbed to his injuries.
The police have arrested Deepak and Monu after lodging a FIR against them.