Watch a preview of the Law & Order Season 20 premiere "Memo From the Dark Side" which airs Friday September 25 on NBC (10-11 p.m ET).
Episode Synopsis: When young war veteran Greg Tanner is found murdered in a Hudson University parking garage, Detectives Cyrus Lupo (Jeremy Sisto) and Kevin Bernard (Anthony Anderson) connect the murder to law professor Kevin Franklin (Guest Star David Alan Basche), an attorney who formerly worked for the Department of Justice. But when the case is brought to court, it seems Tanner (Guest Star Creighton James) may have been more affected by the war than his discharge stated. Lupo and Bernard find that the pieces start to fit when Franklin's memos from the Bush Administration are leaked. Also starring: S. Epatha Merkerson (Lieutenant Anita Van Buren), Sam Waterston (District Attorney Jack McCoy), Alana De La Garza (Connie Rubirosa), and Linus Roache (Michael Cutter).