Shan Yi-cheng, an arms broker who had tried to mediate Taiwan's purchase of minesweepers from Germany, was a key figure in the Yin case, but he fled Taiwan amid suspicions of his involvement in the Yin murder. This past July, however he was deported to Taiwan by authorities in Hong Kong. The special task force is now looking into whether Shan paid bribes via another arms broker to Kuo Li-heng.
今年七月中旬，曾為海軍總部購買獵雷艦的軍火商、也是命案關鍵人之一的單亦誠自香港遣返台灣，由於單亦誠涉嫌透過另一軍火商行賄郭力恆，檢警專案小組開始深入追查，希望對懸宕多年的尹案有所突破。