A mortality study of dye workers (SIC-3999) was conducted. The cohort consisted of 807 fur dyers, fur dressers and fur service workers, identified through the pension program of the Joint Board of the Fur, Leather, and Machine Workers Union. The fur workers retired between January 1, 1952 and December 31, 1977. All subjects were required to have 20 years of continuous active membership in the union and to be 62 years or older. The vital status of the cohort was determined as of December 31, 1977. Standardized mortality ratios were calculated using the general population of New York City as the reference population. A total of 468 decedents was found. Among fur dyers, total mortality was less than expected due to decreased mortality from cardiovascular diseases and nonmalignant respiratory diseases. Slight excesses in mortality from cancers of the stomach, lung, and colorectal systems occurred. Among fur dressers, mortality from all malignant neoplasms was significantly higher than expected. This was due primarily to a 2 fold increase in lung cancer deaths and a slight, nonsignificant increase in mortality of the colorectal system. Fur service workers were the only group to experience a statistically significant increase in cardiovascular related deaths. These subjects also had a slight increase in mortality due to colorectal and stomach cancer. The author suggests that after correcting for urban residence and ethnic effects, increased stomach cancer mortality observed in the fur dyers and lung cancer in the fur dressers may be influenced by occupational exposures.