Mason will begin performances as the merry murderess June 28 and will stay with the production through Dec. 4, according to a production spokesperson. Mason succeeds Brenda Braxton, who will play her final performance June 26. Braxton will return to the tour of Chicago, which plays Japan later this summer.

Mason will join a company that features Charlotte d'Amboise as Roxie Hart, Mary Testa as Matron "Mama" Morton, R. Lowe as Mary Sunshine, P.J. Benjamin as Amos Hart and Brent Barrett as Billy Flynn.

Luba Mason has been seen on Broadway in The Capeman, Jekyll & Hyde, How to Succeed in Business Without Really Trying, The Will Rogers Follies, Sid Caesar & Company and Late Nite Comic. Her other theatrical credits include Show Boat and the recent Reprise! mounting of Pippin. Mason's screen credits include "Law & Order," "New York Undercover," "One Life to Live," "Another World" and "Scandalous Art." Her solo recording is titled "Collage."

Chicago won the Tony for Best Revival of a Musical in 1997 as well as awards for actors Bebe Neuwirth and James Naughton, director Walter Bobbie, lighting designer Ken Billington and choreographer Ann Reinking. The original production was directed and choreographed by the late Bob Fosse.

The Ambassador Theatre is located at 215 West 49th Street.