ATF Special Agent William Sheldon was to be buried Monday in a suburb of Orlando.
Officials with the Bureau of Alcohol, Tobacco, Firearms and Explosive say Sheldon had been battling cancer for a year.
Sheldon was part of a five-man ATF team that responded to the World Trade Center site in New York in 2001.
Three members from the team developed cancer, which doctors linked to exposure to debris from the towers.
Sheldon is survived by a wife and two grade-school age children.
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