The shooter also wounded two Americans and four Jordanians, one of them critically, said the spokesman, Mohammed Momani.
The motive was not immediately clear. Momani described the shooter as an "attacker" and said he committed a "crime," but did not say whether authorities considered the fatal shooting a terror attack.
The shooting, at a police training camp on the outskirts of the Jordanian capital, raises questions about Jordan's image as an island of relative stability in a turbulent region.
In a statement released by Jordan's state news agency, Petra, Momani said an investigation has been launched into "the reasons behind the crime."
In Washington, there was no immediate response from the Pentagon. The US Embassy in Jordan said that it is in touch with Jordanian authorities, "who have offered their full support."
US forces in Afghanistan have come under attack on a number of occasions by local police and troops serving alongside them, in what are known as green-on-blue assaults.
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