11.   The cause was pulmonary fibrosis, said Knox Burger, his agent.

12.   The cause of death was pulmonary fibrosis, his family members said.

13.   The cause was complications from pulmonary fibrosis, said his wife, Mary Ann Badner Sandfort.

14.   The cause was pulmonary fibrosis, a progressive degeneration of the lungs, according to the YMCA of Greater New York.

15.   The cause was pulmonary fibrosis, a progressive degeneration of the lungs, said his son Christopher, of Massapequa, N.Y.

16.   The cause was pulmonary fibrosis, the family said.

17.   The cause was complications from pulmonary fibrosis, said his son Alan.

18.   The cause was pneumonia following pulmonary fibrosis, according to the Oak Ridge National Laboratory, where Datz worked for most of his career before retiring last November.

19.   The cause was pulmonary fibrosis, said a friend, Betsy Flagler.

20.   The cause was complications from pulmonary fibrosis, his family said.