South Korean Foreign Ministry confirmed Tuesday that a 29-year-old man was the second South Korean hostage killed by the Taliban in a standoff where 21 people remain captive. The body of Shim Sung-min, a former information technology worker who was a volunteer with a South Korean church group on an aid mission to Afghanistan, was found Tuesday morning by Afghan authorities. Shim was the second hostage killed in the standoff that began July 19 when the group from the Saemmul Community Church was seized from a bus while driving from the Afghan capital, Kabul, to the southern city of Kandahar. Two deadlines given by the captors for the release of Taliban prisoners passed Monday without any action, before the insurgents said late Monday that a second hostage has been shot. The Taliban have threatened to kill all the hostages if their demands are not met.