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The woman had recently arrived from Guinea, one of three countries that have been designated for special attention to travelers because of outbreaks of the lethal virus. Liberia and Sierra Leone are the other two countries.
The New York City Health Department said that the last time the woman was checked, she did not have symptoms of Ebola. People who are being monitored are checked daily.
There are about 350 people on the city’s list of people being monitored for Ebola.
A New York City official briefed on the woman's death told ABC News, "Earlier today, an individual who came to the U.S. from one of the three Ebola-impacted nations in West Africa within last three weeks died of an apparent non-Ebola condition. This individual at no time showed any symptoms of Ebola. However, due to travel history and an abundance of caution, an Ebola test will be performed on this individual's remains. Test results are expected later tonight or early tomorrow morning."