Linus Roache, who starred in NBC's Kidnapped, has joined Law and Order as an assistant district attorney. His character will replace Jack McCoy (Sam Waterston), who moves to serve as New York district attorney. McCoy (Waterston) replaces D.A. Arthur Branch, who was played by former real-life senator Fred Thompson. Thompson left the series to explore a possible presidential bid.

Roache also appeared in Canterbury's Law, a midseason pilot for FOX starring Juliana Margulies as a lawyer who doesn't mind bending the rules. It's unknown at this time whether or not Roache will appear in both series.

Roache's other credits include the movies Batman Begins and the TV movie RFK, in which he played Robert F. Kennedy.