Law & Order (NBC) Returns Wednesday, April 23 at 10 p.m. So Far This Season: It's been a season of turnover on NBC's longest-running drama. Jeremy Sisto and Linus Roache joined the cast as a new homicide detective and prosecutor, respectively, while Sam Waterston's Jack McCoy has taken on the more political post of Manhattan's district attorney. When It Returns: Still more cast changes are in store: Jesse L. Martin, who plays Detective Ed Green, is departing the series, with "K-Ville" star Anthony Anderson in talks to replace him. Jeremy Sisto of 'Law & Order.' Photo courtesy of NBC.