He struck during morning rush hour. He used an AK-47 rifle. He killed two people and wounded three outside the CIA headquarters in Langley, Va. Then, he slipped out of the country and eluded authorities for four, long years. He was the other Beltway shooting spree killer: Mir Aimal Kasi. On Jan. 25, 1993, the Pakistan-born Kasi opened fire on commuters as they sat in their cars waiting at a stoplight outside the CIA complex. He gunned down Frank A. Darling, 28, an officer in covert operations, and Lansing H. Bennett, 66, an intelligence analyst. Darling's wife, a CIA logistics...