ROCHESTER, N.Y. (CBSNewYork/AP) — An upstate New York woman has been indicted, on a charge that she lied on a form while buying two guns later used to ambush and kill firefighters in upstate Webster on Christmas Eve.

A grand jury indicted Dawn Nguyen on Wednesday on one count of falsifying business records. Nguyen, who was initially arrested in December and faces similar federal charges, has previously pleaded not guilty.

Nguyen’s lawyer, Matthew Parrinello, says Wednesday’s action was expected and that Nguyen will remain free pending arraignment.

Authorities say Nguyen bought a rifle and shotgun for William Spengler in 2010, but said they were for her.

Michael Chiapperini, 34, and Tomasz Kaczowska, 19, were killed on Dec. 24 of last year after Spengler, a 62-year-old ex-convict, armed himself with three weapons and set his house on fire in Webster to lure first responders into a death trap, police said.

Two other firefighters, Joseph Hofsetter and Theodore Scardino, were both wounded in the incident.

Police said they also found a body in the Spengler home, presumably that of his sister, 67-year-old Cheryl Spengler.

The gunman shot and killed himself after the attack.

Police said Spengler was using a Bushmaster .223-caliber rifle – the same gun as used by the gunman in the Sandy Hook elementary school massacre in Newtown, Conn.. He was also armed with a .38 revolver and a shotgun.

Spengler had served 17 years for manslaughter in the death of his grandmother. He served time until 1998 and was on parole until 2006.

A New York woman has been indicted on a charge she lied on a form while buying two guns that authorities say a neighbor used two years later to ambush and kill firefighters.

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