Details of the agreement reached this week have not been released, but police say the teen will serve at least 10 years behind bars. He had been facing a maximum 40-year sentence and was set to go to trial Monday.
The boy and his girlfriend were charged in the Aug. 17 shootings that killed 46-year-old Darlene Nevil at her home in Garland, Texas. Her husband, Alan Nevil, 48, was also shot, but did not die until Sept. 2. He was able to tell police who shot him.