Daniel Petric shot his parents — killing his mother — because they wouldn’t allow him to play the violent video game Halo 3, prosecutors told a judge at the boy’s murder trial Monday.

Prosecutors are not seeking the death penalty because of Petric’s age. In their opening state ments, prosecutors outlined this version of events surrounding the shooting:

In September 2007, Daniel, then 16, had sneaked out of his bedroom window to purchase the game at a store against his father’s orders. When he returned home, his parents caught him with the game and took it from him. His father, Mark, a minister at New Life Assembly of God in Wellington, put the game in a lockbox in a closet where he also kept a 9mm handgun, according to prosecutors.

About a month later, on Oct. 20, 2007, Daniel used his father’s key to open the lockbox and remove the gun and the game. The boy shot his parents, killing his mother and gravely wounding his father. As his father lay wounded, Daniel tried to place the gun in his father’s hand.

Daniel fled after his sister and her husband arrived at the house, taking the Halo 3 game with him.