Ahmad Wais Afzali is accused of lying about phone calls he made to terror suspect Zazi and Zazi's father, Mohammed. Officials say those phone calls tipped the younger Zazi off that authorities were on to him.
Afzali has denied any wrongdoing. Through his lawyer Ron Kuby, Afzali has said that New York City cops approached him, showed him photos of suspects and then asked him for help in the investigation. Kuby has said authorities did not provide Afzali with any "road map" on how to come up with information.
Najibullah Zazi, who is currently charged in Brooklyn on terror conspiracy counts, had known Afzali from the Queens neighborhood he lived in before moving to Denver. Zazi remains behind bars, while Afzali is free on bail after being arrested last month.
Investigators continue to look for others might have helped Zazi in the alleged plot.