The incident took place last night when the victims were on their way to Tara nagar in Churu and their car overturned while trying to save a Nilgai (blue bull).
"66-year-old Jagmal Singh Sansi succumbed to injuries, while his son Chandrashekhar, driver Shivpal and gunman Begraj were injured in the incident. The injured are being treated," a police official said.
Sansi was appointed as the chairman of the board in December last year.
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