Mario Palacios, a 43-year-old Colombian former soldier, appeared at a federal court in Miami on Tuesday afternoon but did not enter a plea. He is scheduled to appear in court again on January 31.
Court-appointed attorney Alfredo Izaguirre told Judge Alicia Otazo-Reyes he recommended Palacios stay in detention because he has no immigration status, relatives or ties to the United States.
Palacios was arrested in Jamaica in October and was scheduled to fly to his native Colombia on Monday.
However, Interpol notified Palacios during a stopover in Panama that the US government was extraditing him, said General Jorge Luis Vargas, director of Colombia's police.
He said Colombia, Jamaica and the US were in touch to co-ordinate the deportation and extradition of Palacios.
The US Department of Justice said in a press release Palacios agreed to travel to the US during his layover in Panama.
Palacios spoke briefly during the court hearing, answering questions about his income and telling the judge he owns a house in Cali, Colombia, and receives a nearly $US370 pension from the army.
Interpol had issued a red alert for Palacios on charges including attempted murder, armed robbery and conspiracy based on a request from the Haitian government.
The office of Haiti's prime minister issued a brief statement, saying only that it wanted justice to prevail in the July 7 assassination of Moise at his private residence.
The office did not reply to additional questions, including whether the government was still seeking to charge Palacios or extradite him to Haiti.
Former Haitian prime minister Claude Joseph said the US taking custody of Palacios was a step in the right direction but he urged local authorities to work with the US to extradite the 43-year-old so he can face justice in Haiti.
Palacios was one of more than a dozen former soldiers accused in the slaying of Moise.
The Colombian government has said the majority of the ex-soldiers were duped and thought they were on a legitimate mission to provide protection and only a few knew it was a criminal mission.
More than 40 suspects have been detained, including 19 former soldiers. Among them is Palacios, who was a member of Colombia's military for 20 years.
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