The estranged husband of the New York gallerist Brent Sikkema, who was found dead in his apartment in Rio de Janeiro in January, is facing “urgent” extradition to Brazil.

Daniel Carrera, 53, has been accused by Alejandro Triana Prevez—the Cuban man arrested for allegedly carrying out the stabbing—of ordering the alleged murder-for-hire. Prevez previously testified that Carrera, who was going through a divorce from Sikkema, paid him $200,000 to commit the murder.

Carrera was arrested last month in New York on charges of passport fraud as U.S. prosecutors branded him a flight risk amid the Brazilian investigation. He was later released on bail.

A judge in the state of Rio de Janeiro said in court documents provided to Artnet News that Carrera must be extradited “with urgency” and denied a request from his defense team to revoke the warrant for his arrest for pre-trial detention.

Judge Tula Correa de Mello also set a hearing date of June 3, when Carrera is expected to appear in court. Brazilian authorities must make a formal request to the U.S. Justice Department for his extradition.

When previously asked by Artnet News whether the State Department had received a request for extradition upon allegations Carrera had masterminded Sikkema’s death, a State Department spokesperson said: “We are aware of those unconfirmed reports. As a matter of longstanding policy, the Department of State does not comment on ongoing extradition matters, including whether or not an extradition request has been made.”

Prevez’s defense team fears that Carrera ultimately will not be extradited to Brazil even though he allegedly conspired to murder an American citizen, attorney Greg Andrade said in a text message.

Carrera did not respond to a request for comment by text message. Fabiana Marques, his lawyer in Brazil told Rio news site G1 that she would fight his extradition, saying her team remained committed to defending his innocence.