A New Jersey man has been positively identified as a victim in the terror attack on the World Trade Center on Sept. 11, 2001, the New York City medical examiner said Thursday.

The identity of Matthew David Yarnell, 26, of Jersey City, was established by retesting DNA samples of remains recovered during the original recovery effort from 2001 to 2002, the medical examiner's office said.

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The number of identifications from the WTC disaster is now 1,640 out of 2,753 people reported missing and presumed killed that day, officials said.

Yarnell, who was single, had worked as an assistant vice president for Fiduciary Trust Co., an international monetary fund that employed more than 500 people on the 97th floor -- four floors above where the second plane struck the south tower.

"Our family never had any doubt that Matthew had died, but we are grateful to the medical examiner for keeping us informed every step of the way," his mother, Michele Yarnell of Kinnelon, New Jersey, said Thursday.

"It's been 14 years, but they've been terrific," she said.

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Her son was a graduate of Carnegie Mellon University in Pittsburgh and had worked at another company in New Jersey before taking the job at the World Trade Center, she said.