June 28, 2008, was a defining moment in my life. It was the day I shot and killed a man in the defense of my life and the lives of others. We all have defining moments. They might not be as tragic as taking another man’s life, but they are events that change the way we look at things — or even, perhaps, how we live our lives.

Before that muggy Saturday evening in June, I would have said my defining moments were many: graduating from high school; enlisting in the Army; getting married; having children; getting run over by a tow truck; and especially, meeting my fiancée, Maria. All of these events, and more, have happened in my life and changed me.