Matthew David Yarnell, 26, of New Jersey, was the 1,640 victim identified in the World Trade Center attacks. View Full Caption Robert Giroux/Getty Images

MANHATTAN — A New Jersey executive of technology at a Wall Street financial firm was identified Thursday as the latest victim of the 9/11 attacks, the Medical Examiner's office announced Thursday.

Matthew David Yarnell, 26, of Jersey City, N.J., became the 1,640 victim identified in the World Trade Center disaster in 2001.

Yarnell worked as an assistant vice president for the technical group of the Fiduciary Trust Co. and was remembered as a prankster who used to call his mother as a salesman trying to sell her random products, according to the New York Times.

The Medical Examiner identified Yarnell after they retested DNA samples from remains recovered during the recovery efforts in 2001 to 2002. There's still 1,113 victims from the attacks reported missing but have not been identified, the Medical Examiner said.

The remains of the unidentified victims were placed in a repository in the basement of the 9/11 Memorial Museum, which 17 families fought to stop in 2012.

The repository is only accessible to workers from the Medical Examiner's office, who periodically retest the DNA samples off-site to identify them, according to the 9/11 Memorial.