Press confirmation, from AP:
"By MICHAEL KUCHWARA – 1 hour ago
NEW YORK (AP) — George Furth, an actor and playwright who wrote the book for the innovative Stephen Sondheim musical "Company," died Monday. He was 75.
Furth died at a hospital in Santa Monica, Calif., said Dennis Aspland, his agent, who didn't know the cause of death.
Furth's collaboration with Sondheim started with 1970's "Company," an unconventional, revuelike musical which followed the tribulations of a thirtysomething New York bachelor and his inability to commit to a relationship. Furth won a Tony for his book of the show, which was directed by Harold Prince and featured the choreography of Michael Bennett..."
George Furth, Sondheim collaborator, dies