These are their stories: Sam Waterston will leave 'Law & Order' later this month after 400 episodesThese are their stories: Sam Waterston to leave 'Law & Order' later this month after 400 episodes - The Associated Press

Sam Waterston, who has played the spiky, no-nonsense district attorney on “Law & Order” since the mid-1990s, is stepping down. NBC says Friday that the last episode for Waterston’s Jack McCoy will be Feb. 22. He has been in more than 400 episodes of the polic…