Season 4 of this police drama opens on a suspenseful, action-packed note as Officer John Nolan (Nathan Fillion) and the entire team frantically race against the clock to find Lopez (Alyssa Diaz) after she is kidnapped on her wedding day in the new "Life and Death." Even as they mount their determined search, Lopez's colleagues know that her life, as well as that of her unborn child, are hanging in the balance. Mekia Cox and Richard T. Jones also star.