Beatty came to Trinity High School in 2000 to be the head coach of the Trinity Shamrocks Football team. The very next year, Beatty led the team to victory over rival Male High School in the 2001 state championship. Beatty kept up his winning streak by winning the state championships in 2002, 2003, 2005, 2006, 2007, 2008, 2010, 2011, and 2012. However, in 2013, the Shamrocks ended the season 6-6. Beatty took this as a sign that his team needed a complete makeover. He said: "It's been a long time since we ended a season with a loss. You find out whether you want to spit that taste out of your mouth or swallow it again."