The second-in-command rank officer, Deepak K Mondal, commanding the 145th battalion of the border guarding force was air evacuated to Kolkata on October 16 due to critical injuries, a senior official said.
"The officer breathed his last at 11:45 am today. He was attacked when he was trying to stop a brazen smuggling attempt along the Indo-Bangla border," he said.
The incident took place at about 2 am near the Belardeppa border post in the Sipahijala district of Tripura early this week when the officer was allegedly hit by a four-wheeler used by the smugglers.
Mondal saw some cattle smugglers and challenged them, BSF officials had said, adding the officer along with his guard and driver tried to stop them.
The group of about 25 smugglers was carrying bricks, lathis, and machetes, they said.
"When challenged, the smugglers tried to gherao the officer and the patrol party. The smugglers' vehicle hit the officer from behind and he sustained the severe injury to his head and legs," the officials said.
An accompanying BSF jawan had fired five rounds from his AK rifle to control the situation, they added.