sentences:  He originated the role of The Balladeer in the original Off-Broadway production of Stephen Sondheim's "Assassins" at Playwrights Horizons, which opened in December 1990 in previews.In 1993, Cassidy starred as Bobby opposite Carol Burnett in a Los Angeles production of Sondheim's musical "Company".In 1995, he portrayed John Wilkes Booth in the Los Angeles Repertory staging of "Assassins".