OWINGS MILLS, Md. — Ray Rice stepped to the microphone, took a deep breath and spoke for 17 minutes about what he called "the biggest mistake of his life." His arrest for domestic violence against his then-fiancee last February is something Rice figures will haunt him long after NFL career has ended. The Baltimore Ravens running back was arrested on assault charges following a Feb. 15 altercation in New Jersey in which he allegedly struck Janay Palmer.