http://www.fox8.com/news/wjw-news-daniel-petric-sentenced,0,644171.story
Defense attorneys argued that Petric's youth and addiction to the game "Halo 3" made him less responsible for the shooting. They say he often played video games 18 hours a day with little food or sleep. They say he may have been so obsessed with the game, where players shoot alien monsters that have taken over the Earth, that he didn't think death was real.