The Tony Award-winning Broadway production of Proof will lose one member of the family June 10, when Larry Bryggman leaves the cast.

The respected Bryggman— nominated for a Tony for Best Actor in a Featured Role, for playing the ailing math genius whose daughter (played Mary-Louise Parker) may have inherited his genius—is the first to leave the four-character drama since it made its New York debut at Manhattan Theatre Club in spring 2000. The production moved intact to Broadway and captured the Pulitzer Prize for Drama earlier this year, and the Tony Award for Best Play June 3. All four cast members were Tony Award nominated (Mary-Louise Parker won). Director Daniel Sullivan won the Tony for Best Director.

Bryggman's "day job" is playing Dr. John Dixon in TV's "As the World Turns." His replacement in Proof, beginning June 12, is Patrick Tovatt, an "ATWT" regular who played Cal Stricklyn for nine years on the CBS soaper. Tovatt was recently the understudy for Philip Bosco in Broadway's Copenhagen. Among his past theatre roles are Prospero in The Tempest, Claudius in Hamlet and Drummond in Inherit the Wind.

Tovatt will play the mentally-ill math professor whose daughter, Catherine, may be afflicted with both his genius and illness. Johanna Day plays the older sibling, Claire, and Ben Shenkman plays Hal, a student of the professor.

Parker continues with the Broadway production through Labor Day. She won the Drama Desk Award for Best Actress in a Play. Proof continues at the Walter Kerr Theatre. A national tour begins at the Seattle Repertory Theatre in September. Casting for the tour has not been announced.