Orange Pop Chicken

4oz. boneless, skinless chicken breasts
12 oz. can diet orange soda
1/4 cup soy sauce
1 cup brown rice

Place chicken in crock pot. Combine soy sauce and orange soda in medium bowl. Pour over chicken. Cover; cook on low 5 to 6 hours. Remove the liquid from crockpot, add water to make 2 cups liquid if needed and bring to a boil in separate pan. Add brown rice and cover and cook according to brown rice package directions. Serve with chicken.