Ground Zero in Ruins. Courtesy CBS News
Adan Gonzalez, 69, died of throat cancer in April, 2015. Mr. Gonzalez had been a photographer and a volunteer at the World Trade Center site, working for two years as a photographer documenting the event and serving other volunteers.
Mr. Gonzalez is one of 1,712 First Responders who died due to the Sept. 11 attacks, 412 who died the day of the attacks (wikipedia) and 1,300 who died from medical complications arising from their search and rescue work. Over 40% of the 4,053 people who died in or resulting from the attack, not counting soldiers killed in Afghanistan or Iraq, or who died after returning home were first responders engaged in search and rescue or cleanup operations, a humanitarian mission.