Police discovered the body of a second South Korean hostage Tuesday slain by the Taliban in central Afghanistan, while relatives of the remaining captives pleaded for the United States to help to resolve the crisis. The Taliban, meanwhile, threatened to kill more hostages if their demands that imprisoned militants be set free were not met by the latest of many deadlines _ noon (0730 GMT) on Wednesday. The dead man's body, dressed in Western clothing and with glasses, was found on the side of the road at daybreak in the village of Arizo Kalley in Andar District, some 10 kilometers (5 miles) west of Ghazni city, said Abdul Rahim Deciwal, the chief administrator in the area.