Mukesh Kumar of the 33 Rashtriya Rifles was killed late on Monday in Kalal area, about 150 km from Jammu, near the LoC that divides Jammu and Kashmir between India and Pakistan.
"According to the report lodged with the police, Mukesh Kumar and Ratinder Kumar of 33 Rashtriya Rifles, posted in Kalal area, had a tiff at about 11.30 pm last night," said Senior Superintendent of Police (SSP), Rajouri, Mubassir Latifi.
According to police, Ratinder Kumar sprayed bullets at Mukesh Kumar from his AK 47 rifle, killing him on the spot. He was later overpowered by other colleagues.
The army is also inquiring into the incident.
A week ago, a paramilitary Sashatra Suraksha Bal (SSB) trooper had shot dead two colleagues and injured two others in Kishtwar.