The medical examiner’s office in New York revealed yesterday they’ve identified the remains of a man killed in the World Trade Center attack on September 11, 2001. Developments in DNA analysis technology finally allowed Mark Desire, assistant director of forensic biology at the medical examiner’s office, and his team to identify a bone as belonging to 26-year-old Scott Michael Johnson.

Johnson is the 1,642nd victim to be positively identified in the terror attacks in which 2,753 people were killed by hijackers who crashed airplanes into the Twin Towers. Johnson was an employee for the investment banking company Keefe, Bruyette & Woods on the 89th floor of one of the towers.

Through the years, several attempts to identify the bone proved unsuccessful until recent improvements allowed Desire’s team to gain sufficient DNA evidence to make a match.

After learning of the development, Ann Johnson told the outlet she and her daughter “sat there and both cried.”

“You get pulled right back into it and it also means there’s a finality,” she said. “Somehow I always thought he would just walk up and say, ‘Here I am. I had amnesia.’”