Agartala: A trooper of the Tripura State Rifles (TSR) gunned down his girlfriend and later shot himself with his service rifle, police said here on Tuesday. Mrinal Das, 32, stormed into the rented house of nursing student Tanushree Karmakar, 25, late Monday night at Durjoynagar near here and shot dead the woman, police spokesman Uttam Kumar Bhowmik told IANS. "Later, Das shot himself dead on the spot," Bhowmik said. The official said that Mrinal, a rifleman of the Ninth Battalion of the TSR, was in relationship with Tanushree for the past few years. "Recently, the girl started avoiding Mrinal after she learnt that he is married," the spokesperson said. The Tripura State Rifles is an elite force of Tripura and trained in line with central paramilitary force to engage in counter-insurgency operations.