Argentina’s courts had rejected extradition requests from the Justice Department, saying the district attorney’s office could not guarantee Mr. Sonnenfeld would be spared the death penalty in Colorado if convicted. But in a new ruling, the Argentine Supreme Court said it now had the assurances it needed to approve the extradition of Mr. Sonnenfeld.

Image Kurt Sonnenfeld Credit... John Prieto/The Denver Post, via Associated Press

However, one of the judges added, it was granting the extradition request on the condition that if Mr. Sonnenfeld were found guilty and sentenced to life in prison, there would be a provision for his parole. The judges said a sentence without the possibility of parole would violate Argentina’s Constitution.

Mr. Sonnenfeld, who is reported to be in his 50s, has requested political asylum in Argentina. He arrived in Buenos Aires a little more than a year after his wife was found by the police, slumped on a sofa in a bedroom at their Denver home on Jan. 1, 2002. She had been shot through the head. Mr. Sonnenfeld, who remarried in Argentina, has said his wife committed suicide.

Prosecutors dropped initial murder charges against him in mid-2002 because of insufficient evidence. New charges were later filed, and Mr. Sonnenfeld was arrested in Argentina and briefly jailed.

He had been a cameraman for the Federal Emergency Management Agency, sent to the World Trade Center shortly after the attacks of 2001 to document the aftermath. He said the video footage he collected indicated that the government had known about the attacks ahead of time.