''Law & Order'' impresario Dick Wolf is here today, which gave me a chance to clear up some cast departures that you folks have been asking about.
Annie Parisse (''L&O'') asked out because she was becoming frustrated over having to turn down movie roles. Wolf called her ''one of the role models of how to leave a show.'' Alana De La Garza (''CSI: Miami'') will be a new ADA on the show.
Jamey Sheridan (''Criminal Intent''), as I've reported before, wanted to spend more time in California, where his family is. Eric Bogosian will succeed him.
Courtney B. Vance (''Criminal Intent'') was at the end of his contract and the writers felt they had done all they could with his character. Nona Gaye -- actress and daughter of Marvin Gaye -- is coming in as a new ADA. (UPDATE: Gaye has reportedly left the series, with Theresa Randle replacing her.)
Annabella Sciorra (''CI'') left by mutual agreement with the show, Wolf said, without elaboration. Julianne Nicholson (from Wolf's ''Conviction'') will play the new partner for Chris Noth.
As for speculation that Sam Waterston is leaving the original ''L&O,'' Wolf called it ''totally, totally fallacious. ... Sam is back for all 22 episodes this year.''
And, in case you missed it, Connie Nielsen will fill in for Mariska Hargitay on ''Special Victims Unit'' while Hargitay is on maternity leave.