A dead nine-month-old female hooded crane (Grus monachus) fecund in Chonnam province was examined pathologically, bacteriologically and toxicologically. Pathologically multiple necrotic foci consisting of infiltration of heterophil, lymphocytes and macrophages, and exudation of fibrin were observed in liver. Kidney had multiple hemorrhagic foci. Aeromonas hydrophila identified by biochemical properties was isolated. Phosphamidon, a kind of organophosphate, was detected massively in feed content of gizzard. From these results, lethal ingestion of phosphamidon was a causative agent of death. In addition, future study has to be done about correlation between liver necrosis and A. hydrophila infection.