An alleged “gay sex party” in London’s Chelsea district ended tragically Thursday night when a man fell 60 ft to his death from a window at the home of the great-grandson of 19th Century German chancellor Otto von Bismarck. Said the Metropolitan Police: “A man in his late 30s was taken to hospital where he was pronounced dead. The victim has not yet been identified, and the incident is being treated as suspicious. A 41-year-old man has been arrested and is in custody.”