Weblaw & order legend jack mccoy has officially tried his last case. Sam waterston’s goodbye to his district attorney character arrived thursday night after three. Webafter more than 400 episodes, sam waterston bid farewell to law & order thursday night as district attorney jack mccoy left the courthouse for the very last. Webthe episode, aptly titled last dance, sees mccoy's last case involve a woman who was found dead in central park and a local tech billionaire with ties to the new york city mayor, robert.