Three of the observers eventually died of conditions that are known to be promoted by radiation: Graves of a heart attack twenty years later at age 55; Cieslicki of acute myeloid leukemia nineteen years later at age 42; and Young of aplastic anemia and bacterial infection of the heart lining twenty-nine years later at age 83. Some of the deaths may have been a consequence of the incident. Louis Hempelman, M.D., a consultant to the Los Alamos Scientific Laboratory, believed that it is not possible to establish a causal relation between the incident and the specifics of the death from such a small sample. He stated this opinion in a publicly available report that included personal medical information which he had previously declined to release to Marion E. Cieslicki during the final stages of his illness.