| United States|
| March 30 (2010-03-30) – July 6, 2010 (2010-07-06)|Vincent D'Onofrio as Detective Robert Goren
Kathryn Erbe as Detective Alexandra Eames
Jeff Goldblum as Detective Zack Nichols
Saffron Burrows as Detective Serena Stevens
Eric Bogosian as Captain Daniel Ross
Mary Elizabeth Mastrantonio as Captain Zoe Callas
Leslie Hendrix as Chief M.E. Elizabeth Rodgers
Michael Gladis – "Love Sick".
Tracy Pollan – a successful and attractive magazine writer in "Traffic".
Lorraine Bracco – "Disciple"; a case where a body discovered at a construction site bears all the hallmarks of a serial killer who was executed more than six months earlier.
Dan Lauria, Ralph Macchio – "Inhumane Society" where a promising young boxer is derailed when authorities discover he's at the center of a dog fighting ring.
Dan Butler, and William Mapother – "Lost Children of the Blood" where the body of a bright young college student is found completely drained of blood.
F. Murray Abraham – as Theodore Nichols (Nichols's father) in a case where the body of a successful real estate agent is discovered in a basement, bled out.
Law & Order: Criminal Intent (season 9) Wikipedia
The ninth season of Law & Order: Criminal Intent premiered on the USA Network March 30, 2010, and ended on July 6, 2010.
After the two-part season premiere, Vincent D'Onofrio, Kathryn Erbe, and Eric Bogosian left the show. Bogosian's character (Capt. Daniel Ross) was killed off in the first part of the premiere. Bogosian was replaced in the cast by Mary Elizabeth Mastrantonio, playing Captain Zoe Callas. Saffron Burrows joined the cast (as Detective Serena Stevens), replacing Julianne Nicholson (who was pregnant and having a child during taping) who played Detective Megan Wheeler. Jeff Goldbum assumed the leading role.
The scene cards return in this season after three seasons.
Episodes from the ninth season of Law & Order: Criminal Intent also aired on NBC beginning Sunday, June 20 at 10:00 PM (Eastern) with repeats of those episodes airing Saturdays starting June 26 at 8:00 PM (Eastern). The episodes aired on NBC until Sunday, September 5, 2010. Bravo began airing ninth-season episodes during early morning hours on Sundays starting November 21 at 2:00 AM until 4:00 AM.