Bristol police identified the victim of the early Saturday morning crash as Robert Valentine of Bristol.
In an interview with The Boston Globe, Patrick Valentine said he and Robert Valentine are the brothers of Terri Hernandez, Aaron Hernandez's mother.
It was the second recent fatal accident involving a Hernandez relative. Thaddeus Singleton III of Bristol was killed when the car he was driving slammed into a country club building on June 30. He was married to Hernandez's cousin.
The former New England Patriots tight end has pleaded not guilty to murder in the death of Odin Lloyd, a semi-professional football player whose body was found June 17 about a mile from Hernandez's home in North Attleborough, Mass.