The bodyguard of Benazir Bhutto, who was to be a key witness in an investigation into her assassination, has been shot dead. Khalid Shahenshah, who was the former Pakistan prime minister's security chief at the time of her assassination, was killed in a drive-by shooting as he left his house in the southern port city of Karachi on Tuesday, police said. Mr Shahenshah, 45, was riding in Mrs Bhutto's bullet-proof car when she was killed in a suicide attack in the northern city of Rawalpindi on December 27. He was expected to be called to give evidence at a United...