Almost three decades after his grisly killing in Germany, the murder of the exiled Iranian entertainer Fereydoun Farrokhzad remains officially unsolved. But an investigation by RFE/RL's Persian-language service, Radio Farda, has uncovered documents that point to Iran's intelligence services. And a former Iranian spy has revealed a possible suspect in the 1992 slaying of the outspoken critic of Iran's hard-line Islamic regime.