The fourth and final act features a soliloquy about the failed State Capitol project and climaxes with the prostitute Cybel comforting the dying title figure, who'd been shot during an arrest attempt.  
The third section of this work opens with the protagonist assuring his workmen that he will fire a man who is already dead.  It begins at a high school dance with the wealthy partner of a construction firm planning out his son's future.  The epilogue features a widow, who'd earlier been repulsed by the true nature of her husband's personality, releasing her two sons to their own lives.  The fourth and final act features a soliloquy about the failed State Capitol project and climaxes with the prostitute Cybel comforting the dying title figure, who'd been shot during an arrest attempt.  The police had been after William for the murder of his "old self," after he had taken on the persona of his architectural rival, Dion Anthony, by literally putting on his face.  For 10 points, identify this expressionistic play that features the use of large masks, a work by Eugene O'Neill
The third section of this work opens with the protagonist assuring his workmen that he will fire a man who is already dead.  
The Great God Brown