Variety reports that Bierko will play criminal defense lawyer Jeffrey Coho on the David E. Kelley series. Bierko will make his first appearance on the award-winning drama Sept. 26. "Boston Legal" begins its third season a week earlier. Bierko, according to the industry paper, will be part of a storyline that concerns a client who is accused of murdering a judge. The client will be played by Ashton Holmes; Katey Sagal will play her mother with Tyler Labine as an assistant D.A. and Anthony Heald as the judge hearing the case.

Craig Bierko made his mark in New York theatre as the Tony-nominated Harold Hill in the Broadway revival of The Music Man. Shortly after, he starred in the short-lived musical Thou Shalt Not. Off-Broadway stints include Modern Orthodox and Fired! Bierko's many screen credits include "Scary Movie 4," "Cinderella Man," "Sex and the City," "Fear and Loathing in Las Vegas" and "Sour Grapes."

"Boston Legal" airs Tuesdays at 10 PM on ABC-TV. William Shatner, James Spader and Candice Bergen co-star. For more information visit http://abc.go.com/primetime/bostonlegal.