A man who gunned down 10 people in a mass shooting was not insane when he unleashed terror in a Boulder King Soopers but instead was a calculated killer who understood what he did was wrong, a prosecutor told jurors Thursday in an opening statement swiftly disputed by the defense attorney. The trial of Ahmad Alissa began after years of legal wrangling over his mental state on the day of the March 2021 shooting in Boulder and will likely focus on whether he was legally sane. Read more: https://www.9news.com/article/news/local/boulder-shooting/boulder-king-soopers-shooting-trial-opening-statements/73-c6f22baf-e4f5-4d23-8e87-564da75ca511 ----- More local videos here: https://youtube.com/@9news Subscribe to NEXT: https://youtube.com/@Nexton9NEWS Stay connected: 9NEWS Website: https://www.9news.com/ Facebook: https://www.facebook.com/ilike9news Twitter: https://twitter.com/9NEWS Instagram: https://www.instagram.com/9newsdenver/ Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.