A 44-year-old police constable shot himself dead with his AK-47 rifle during the Republic Day function at a government senior secondary school in Jagraon, 45 km from here.
Manjit Singh died on the spot, police said.
The constable was deputed as gunman of the Jagraon City police station SHO.
He was depressed because of some family problems, police said.
They said investigations were in progress and the body has been sent to a civil hospital for post-mortem.