Summary: <p>In 2003, Pat Tillman wrote a "just in case" letter to his wife before leaving for Afghanistan to serve with the Army Rangers. The former NFL football player was killed while on duty on April 22, 2004. The military first blamed an enemy ambush, and later revealed Tillman was killed by friendly fire. Years of inquiries and hearings into his death followed. During this time, Marie Tillman tried to stay out of the media as she dealt with her grief. She talks about her new book, "The Letter: My Journey Through Love, Loss and Life."</p>
