Pilot For the 1988 pilot,
George Dzundza and
Chris Noth were cast as the original detectives, Sergeant
Max Greevey and Detective
Mike Logan. The producers felt that Dzundza would be a perfect senior police officer as he was someone the producers felt they could see themselves riding along with in a police cruiser. Noth and
Michael Madsen were candidates for the role of Logan. Madsen initially was considered the perfect choice for the role, but, in a final reading, it was felt that Madsen's acting mannerisms were repetitive, and Noth received the role instead. Rounding out the police cast,
Dann Florek was cast as Captain
Donald Cragen. On the prosecutor's side,
Michael Moriarty was Dick Wolf's choice to play Executive Assistant District Attorney
Benjamin "Ben" Stone. The network, however, preferred
James Naughton, but, in the end, Wolf's choice would prevail, and Moriarty received the role. As his A.D.A.,
Richard Brooks and
Eriq La Salle were being considered for the role of
Paul Robinette. The network favored La Salle but, once again, the producers' choice prevailed, and Brooks received the role. As their boss,
Roy Thinnes was cast as District Attorney Alfred Wentworth.
Seasons 1–3 Nearly two years passed between the pilot and production of the series. The producers held options on Dzundza, Noth, Moriarty and Brooks. Each was paid holding money for the additional year and brought back. Florek also returned. Thinnes, however, was starring in
Dark Shadows and declined to return. In his place, the producers tapped
Steven Hill to portray District Attorney
Adam Schiff,
J. K. Simmons had the recurring role of
Dr. Emil Skoda, a psychiatrist who worked with the Police Department. He appeared in 41 episodes until 2004. He then reappeared for three episodes in season 20. Bratt left the series at the end of season 9, stating it was an amicable departure and he expected to eventually return for guest appearances. (He ultimately returned for the season 20 episode "Fed".) Detective Curtis was written off as leaving the force in order to take care of his wife, who was suffering from
multiple sclerosis, in her final days. He was replaced by
Jesse L. Martin as Detective
Ed Green, who was conceived of as more of a loose cannon in the mold of Noth's Logan than Bratt's Curtis was. (Briscoe was described as being a recovering alcoholic, as Cragen had been. Green was described as being a recovering compulsive gambler.) In 2000, Steven Hill announced he was leaving the series after season 10. Hill, who was the last remaining member of the original cast, said his departure was mutual with the producers. He was replaced by
Dianne Wiest as Interim District Attorney
Nora Lewin, and Adam Schiff was written out off-screen as departing to work with Jewish charities and human-rights organizations in Europe. The following year, Harmon left the show after three seasons (with Abbie Carmichael written off as being called on to serve the U.S. Attorney's office) and was replaced by
Elisabeth Röhm as Assistant District Attorney
Serena Southerlyn. The year after that, Wiest left the show after two seasons and was replaced by retiring U.S. Senator
Fred Thompson as District Attorney
Arthur Branch, whose character was conceived of as being much more right-leaning than his predecessors in the D.A.'s office, and was a direct reaction to the
September 11 attacks. No mention was made on the show of what happened to Nora Lewin, though producers said her character was only supposed to be an interim D.A.
Seasons 15 & 16 After 12 years on
Law & Order, Orbach announced in March 2004 that he was leaving the show at the end of season 14 for the spin-off
Law & Order: Trial by Jury. Lennie Briscoe was written off as retiring from the NYPD and later taking a position as an investigator for the D.A.'s office. He was replaced at the 27th Precinct by Detective
Joe Fontana, played by
Dennis Farina. but it was eventually revealed that he had been battling
prostate cancer (for over 10 years) and that his role on
Trial by Jury was designed to be less taxing on him than his role on the original series was. However, Orbach died from his cancer on December 28, 2004, and was featured in only the first two episodes of
Trial by Jury. (His character was subsequently written off as having also died off-screen, though this was not revealed on the original series until the season 18 episode "Burn Card".) In Season 15, Röhm left the show mid-season in January 2005. Röhm's final scene on the show, in the episode "Ain't No Love", sparked controversy within the fanbase, as A.D.A. Southerlyn asked Arthur Branch if she was being fired because she was a lesbian, a fact the scripts had never hinted at until then. Wolf said Röhm's departure was unexpected. For a few seasons, Southerlyn had often argued opposing points to McCoy and Branch, the latter of whom thought she would be better as a defender rather than a prosecutor. Southerlyn's replacement was
Annie Parisse as Assistant District Attorney
Alexandra Borgia. Martin left the show midseason to film
Rent. Ed Green was temporarily written off as being shot in the line of duty and was replaced during his recovery by Detective Nick Falco, played by
Michael Imperioli, who had previously guest-starred as a murder suspect in the season 6 episode "Atonement". Parisse left the series at the end of season 16 (with A.D.A. Borgia written off as being murdered), and Farina shortly afterward announced that he was leaving the show to pursue other projects. (Detective Fontana was written off as having retired off-screen.)
Seasons 17–20 By this point, NBC executives believed the series was beginning to show its age, as the ratings had been declining since Orbach's departure. She also briefly appeared as a bartender in the season 16 episode titled "Flaw". However, Govich proved to be even more unpopular with fans than her predecessor was and left the show after one season with the explanation being that Detective Cassady's assignment to the precinct had been temporary and had been transferred out. She was replaced by
Jeremy Sisto, who had previously guest starred as a defense attorney in the season 17 episode "The Family Hour", as Detective
Cyrus Lupo. Around the same time, Thompson announced he would leave the show to seek the
2008 Republican presidential nomination. (No explanation was given within the show regarding Arthur Branch's off-screen departure.) Waterston's character was promoted to Interim District Attorney (later made full District Attorney in season 20) and his former position was filled in by Executive Assistant District Attorney
Michael Cutter, played by
Linus Roache. Martin later announced that he would leave the show for the second and last time near the end of season 18 to pursue other endeavors, and Detective Green was written off as resigning from the force due to burnout. He was replaced by
Anthony Anderson as Detective
Kevin Bernard. However, the cancellation of the show rendered this moot.
Season 21–present (revived series) In
Deadline Hollywood, Nellie Andreeva announced the series was returning. At that time it was also reported that
Sam Waterston and
Anthony Anderson, who starred in earlier seasons of the series, and additional former cast members were also in talks to return. Waterston previously stated in 2015 that he would be open to returning. Other previous cast members including
S. Epatha Merkerson,
Jeremy Sisto and
Alana de la Garza hold starring roles on
Chicago Med or
FBI, with both also being part of the franchise and Wolf Entertainment series. On November 23, 2021, it was announced that
Hugh Dancy had been cast as an assistant district attorney and that Anderson had signed a one-year deal to return as Detective
Kevin Bernard. On December 10, 2021, it was revealed that
Camryn Manheim had been cast as Lieutenant Kate Dixon, the successor to Merkerson's character, Lieutenant
Anita Van Buren. Manheim portrayed minor characters in previous seasons of the series. In December 2021,
Odelya Halevi was added to the cast as Assistant District Attorney Samantha Maroun. A day later, Waterston was announced to have finalized a one-year deal to return as District Attorney
Jack McCoy. On May 10, 2022, the series was renewed by NBC for a 22nd season. Later that same month, it was announced that Anderson would leave the series. On June 7, Waterston signed a new deal to return for the 22nd season, making him the longest-running cast member of the series. A week later,
Mehcad Brooks joined the cast in the new season, replacing Anderson as Detective Jalen Shaw. On November 15, 2023, it was announced that Donovan would be not returning for the 23rd season. A week later,
Reid Scott joined the cast for the 23rd season, replacing Donovan as Detective Vincent Riley. On February 2, 2024, it was announced that Waterston would depart from the series and
Tony Goldwyn would join the cast as District Attorney Nicholas Baxter. On May 10, 2024, it was announced
Camryn Manheim would depart the series after season 23. On July 22, 2024,
Maura Tierney was cast as a new lieutenant for season 24, replacing Manheim as Lieutenant Jessica Brady. In May 2025, NBC renewed the series for its twenty-fifth season. On September 24, 2025, it was revealed that
David Ajala was set to join the show's main cast as an NYPD detective partway into its 25th season, replacing Brooks. Ajala would debut on
Law & Order as Detective Theo Walker on the November 13, 2025 episode
Guardian. ==Plot==