A Georgia teen killed his great-grandmother and wounded his grandmother with a sword before cops took him down with a stun gun, officials said.

Cops in Douglasville arrived at the home Monday afternoon to find the dead woman lying in the front yard and the 15-year-old boy standing in the doorway with a sword and a pellet gun, which he used to shoot out the windows of their squad car, Douglas County Sheriff Phil Miller told The Associated Press.

Inside, they found the grandmother, who is in her 50s, barricaded inside a room. She was taken to the hospital and treated for non-life-threatening injuries, Miller said.

Authorities had been to the home before on reports of the teen being violent.

"We've arrested him on two different occasions. Once in June where he had another sword, which is in evidence. This is not the same sword. He cut his grandmother on the foot with it that time," Miller said, according to CBS Atlanta.