From a New York Times obit by Richard Sandomir headlined “Kenny Moore, Marathoner and Track Writer, Dies at 78”:

Kenny Moore, a two-time Olympic marathon runner who used his deep understanding of athletes to become a pre-eminent track writer at Sports Illustrated for nearly 25 years, died at his home in Kailua, Hawaii.

His brother, Bob, confirmed the death. He did not know the cause but said that Mr. Moore had physically wasted away.