Authorities said Thomas Phelan, a New York ferry captain who later became a city firefighter, died Friday.
The New York City Fire Department said when the Twin Towers were hit, Phelan helped ferry people from Lower Manhattan.
In 2003, Phelan joined the FDNY as a firefighter and was promoted to Marine pilot, according to authorities.
Mayor Bill de Blasio sent a tweet Sunday honoring Phelan's service and sacrifice.
Phelan is one of the thousands of victims of cancer linked to the 9/11 attack.
His funeral is scheduled for Tuesday in Brooklyn.
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