Jill Hennessy is headed back to the courtroom.

The actress, who played Assistant District Attorney Claire Kincaid for many years on Law & Order, will guest star later this year on The Good Wife Season 5.

According to CBS sources, Hennessy will portray a New York attorney named Rayna Hecht on the March 16th installment, titled "A Few Words."

She will battle it out in court with Alicia and Cary as those two wonder whether this adversary could be a potential partner.

New York Mayor Bill De Blasio will make a cameo as himself on the same episode.

Hennessy has more recently appeared on Crossing Jordan and Luck, while The Good Wife finally returns with new episodes on March 9.

Watch The Good Wife online now if you need to catch up before then.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.