71.   The cause was a heart ailment, the organization said.

72.   The cause was not immediately clear, but he had been suffering from kidney and heart ailments for several years, his son, Lindsey, said.

73.   The causes were complications from a heart ailment and general physical deterioration, said a nephew, Youm Abey Fesseba, the Associated Press reported.

74.   The cause of death was a heart ailment, said his companion, Margaret Croke.

75.   The cause was a heart ailment, according to the laboratory at Cambridge University where he spent most of his career.

76.   The cause was a heart ailment, said her husband, Joseph Gurwin, a retired textile manufacturer.

77.   The cause was a heart ailment, said Roger Williams, a spokesman for the university.

78.   The cause was a heart ailment, The Associated Press reported.

79.   The cause was a heart ailment, according to the Princeton Plasma Physics Laboratory, where he worked.

80.   The cause was a heart ailment, his family said.