Woman Helped Firefighters’ Killer Get Ambush Gun, Police Say

According to the police, the woman, Dawn Nguyen, 24, bought a Bushmaster semiautomatic rifle and a Mossberg 12-gauge shotgun from a gun shop more than two years ago on behalf of William Spengler Jr., who as a felon was not permitted to buy or own a gun.

Mr. Spengler apparently used the rifle on Monday to kill the firefighters, whom he lured to his home in Webster, N.Y., near Lake Ontario, by starting a fire, the authorities said. After shooting at other emergency responders, Mr. Spengler shot himself in the head with another weapon, a handgun, an autopsy revealed. The fire destroyed seven homes.

Ms. Nguyen went with Mr. Spengler to buy the weapons at a shop in June 2010, according to a criminal complaint filed by the United States attorney in the Western District of New York.

When the police asked her about the purchase after the shooting, she claimed the guns were for her own protection. She also said they had been stolen from her car, although the police said no report had been filed to support that claim.

The complaint said Ms. Nguyen had told a friend that she bought the weapons for Mr. Spengler. The police said that assertion was corroborated by what Mr. Spengler wrote in a suicide note, in which he said a neighbor’s daughter helped him acquire the guns.

Since the guns were not intended for her, the complaint said, she made a false statement when she bought them, a felony that is punishable by up to 10 years in prison.

Ms. Nguyen is “the person who purchased that rifle and that shotgun found next to William Spengler,” William J. Hochul Jr., the United States attorney for the Western District of New York, said at a news conference in Rochester on Friday.

Ms. Nguyen’s lawyer could not be immediately reached for comment.

The Webster police chief, Gerald L. Pickering, said that based on the distance between Mr. Spengler’s hiding place and where his victims were found, he most likely used the Bushmaster.

A similar gun was used in the Newtown, Conn., school shootings, which prompted a renewed debate about the nation’s gun laws. Much of the discussion has been focused on whether military-style assault weapons like the Bushmaster should be banned.

On Thursday, the State Police released the autopsy results of the two firefighters who were killed and their attacker.

Michael Chiapperini, 43, died as a result of a gunshot wound and Tomasz Kaczowka, 19, died as a result of two gunshot wounds, the police said. Mr. Spengler, 62, was killed by a self-inflicted gunshot to his head.

Funeral and memorial services are planned for Mr. Chiapperini and Mr. Kaczowka during the weekend. Hundreds of firefighters and police officers from around the region were pouring into Webster on Friday.

The police have also recovered human remains in Mr. Spengler’s home, which was among the buildings that burned, but the remains have yet to be positively identified. Earlier this week, Chief Pickering said the police believed that the remains belong to Cheryl Spengler, 67, Mr. Spengler’s sister.

The two had fought bitterly in the past, friends and neighbors said, and they may have been involved in a dispute over who would take ownership of the family home following the death of their mother, Arline, in October. Mr. Spengler served 17 years in prison for the 1980 murder of his grandmother, whom he killed with a hammer.

It remained unclear what motivated him to target emergency responders, but he made his intentions clear in the note he left behind: he wanted to kill as many people as he could.

When the police arrived at the scene of the fire just before dawn on Monday, they were met by a fusillade of bullets. A SWAT team was called in to help thwart the gunman. As the gun battle raged, the fire spread.

The autopsy report showed that Mr. Spengler was not struck by any bullets fired by law enforcement officers.

Michael D. Regan contributed reporting.

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