According to Variety, Jack Nicholson is joining Leonardo DiCaprio and Matt Damon in Martin Scorsese's The Departed for Warner Bros., starting in April.

Nicholson would play an Irish gang boss while the younger duo are opposing undercover cops. A femme costar is yet to be chosen to play a cop psychiatrist, Leo said. Nicholson tells me the role "could be interesting," and admits he's been "looking for a bad guy -- I did three comedies." And hasn't been in front of the cameras for almost two years.

He's met with both Leo and Marty with whom he's been friends "for many years and we'd been looking for something to do together." And he worked with Matt Damon on a charity benefit show. As for playing a Boston Irishman, Nicholson laughs, "I won't have to act much."

The Departed was released October 6th, 2006 and stars Leonardo DiCaprio, Matt Damon, Jack Nicholson, Mark Wahlberg, Martin Sheen, Ray Winstone, Vera Farmiga, Anthony Anderson. The film is directed by Martin Scorsese.