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 A former Oslo schoolteacher, Waitz won her first New York City Marathon in 1978, setting a world best in 2 hours, 32 minutes, 30 seconds in her first attempt at running the distance. She went on to win eight more times
-- more than any other runner, male or female -- with her last victory coming in 1988. She won the London Marathon twice, in 1983 and
'86, and earned five titles at the world cross-country championships from 1978-81 and 1983.
Waitz also won the gold medal in the marathon at the 1983 world championships in Helsinki, Finland. A year later, she took second behind Joan Benoit in the first women's Olympic marathon.
She also competed at the 1972 and 1976 Olympics in the 1,500 meters, but missed the 1980 Moscow Games because of the American-led boycott.
"Grete is in my eyes one of the greatest Norwegian athletes of all time," Norwegian Athletics Federation president Svein Arne Hansen said. "Not only through her performances in the sport, but also as a role model for women in sports."
Waitz started undergoing cancer treatment in 2005 but rarely discussed her condition in public. Like Waitz, Aanesen declined to specify which type of cancer she had.
"She didn't wish to put too much focus on herself and her disease, but hoped she could contribute in some way to help others," said Aanesen, who got to know Waitz through her work with the foundation.
"She was a fantastic and immensely successful sports practitioner and also a role model and pioneer in women's sports," Aanesen said. "She showed that women too can run longer distances than 1,000 meters."
Aanesen said a private funeral ceremony is planned for next week, according to Waitz's wishes.
Waitz is survived by her husband, Jack Waitz, and her two brothers, Jan and Arild.
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