The remains of a 31-year-old Belgian man who died in the Sept. 11 attack on the World Trade Center were identified through additional DNA testing, the city medical examiner announced Tuesday.

Patrice Braut, a native of Anderlecht, a community on the outskirts of the Belgian capital Brussels, was working on the 97th floor of the North Tower when he was killed. Braut was employed in the technology section of the firm Marsh & McLennan. He was the only Belgian national killed in the attacks.

Braut's remains were among those recovered between 2001 and 2002. A spokeswoman for the medical examiner said additional DNA testing of samples helped make the latest identification, which represents the 1,639th victim identified. A total of 2,753 people are known to have lost their lives at the trade center site. Remains for 1,114 people or about 40 percent have yet to be identified from nearly 22,000 body parts and fragments recovered.

Braut's parents were featured in news stories when they arrived back in New York in 2002 to take part in the Sept. 11 memorial services at Ground Zero. Braut was their only child.