BRIDGEPORT — Jury selection in the federal case against the New Milford man accused of illegally selling a gun that was later used in a Danbury homicide has been reset to Sept. 8.

Nikos Chelioudakis, 35, was indicted by a federal grand jury Feb. 20, and arrested the following month on the charges of possession of a firearm with an obliterated serial number, unlawful possession of a firearm by a prohibited person and unlawful sale or transfer of a firearm to a prohibited person.

The indictment alleges that Chelioudakis — an “unlawful user” of a controlled substance — sold a gun to Danbury resident David Ramos, knowing he was also likely an unlawful user of a controlled substance.

Ramos, 34, is facing a first-degree manslaughter charge following the fatal shooting of his friend — 33-year-old Jason Hoffman, of Brewster, N.Y. — in Danbury last September.

At the time of the killing — which has been described as accidental — Ramos and Hoffman were high on crack-cocaine in the basement of a Hancock Drive apartment where Ramos lived, police said.

Investigators found a .22-caliber Walther P22 with the serial number scratched off in a storm drain about 50 feet from Ramos’ residence, and markings on a shell casing found on Ramos’ nightstand matched those on most of the live rounds in the gun’s magazine.

In a joint investigation with the Bureau of Alcohol, Tobacco, Firearms and Explosives, Danbury police said they determined that Chelioudakis had sold the handgun with “an obliterated serial number” to Ramos.

Each charge against Chelioudakis carries a maximum term of 10 years in federal prison.

He is being represented at the U.S. District Court in Bridgeport by federal defender Daniel Murphy Erwin and was granted permission by the court last month to transfer to a residential drug and alcohol addiction treatment facility in Lebanon, Conn., according to court documents.

He is being represented by federal defender Daniel Murphy Erwin. Leonard C. Boyle from the U.S. Attorney’s Office and Elena Lalli Coronado from the Department of Justice are representing the United States of America.