Sam Waterston is stepping down as DA Jack McCoy in “Law & Order.” Waterston’s last episode will air on Feb. 22. Scandal’s Tony Goldwyn has been tapped as his replacement, though details on the new district attorney have not yet been revealed. “It’s a pleasure to talk directly like this to the backbone of Law & Order’s absolutely amazing audience. The time has come for me to move on and take Jack McCoy with me,” Waterston said in a statement. “There’s sadness in leaving, but I’m just too curious about what’s next.” Waterston appear in more than 400 episodes since his debut as McCoy in the Season 5 opener.