QUINCY — A 46-year-old woman is being held without bail after police say she killed herhusband in front of their daughter during an argument about an illegal gambling operation the couple were running out of a Wollaston basement.

Police say Huixian Liu of Boston stabbed her husband, 55-year-old Biqiang He, in a house on South Central Avenue during an argument Thursday. He was taken to Quincy Medical Center, then to Boston Medical Center, where he died Sunday.

Liu was arraigned Friday, before He’s death, on a charge of armed assault with intent to murder and is being held without bail pending a dangerousness hearing later this week.

David Traub, a spokesman for the Norfolk County district attorney’s office, said prosecutors will “examine the existing assault charges in light of the victim’s death” ahead of Liu’s scheduled Friday court appearance.

Police responded to reports of a stabbing at 10 South Central Ave. in Quincy at about 7 p.m. Thursday, July 4, according police reports filed in court. One officer wrote that he was familiar with the house because the city had shut down an illegal gambling operation in its basement two days before.

Witnesses told police that Liu and He were arguing about letting the city inspector into the two-family home’s basement to see gambling machines earlier in the week. The witness said the pair started to “wrestle and grapple with each other,” and He’s leg began bleeding.

“She only did it by accident and it was not on purpose,” the witness said, according to the officer’s report.

Officers wrote that the couple’s daughter was also at the scene, and that she told police “her parents were fighting and she told them to stop but they wouldn’t listen.”

The victim was lying face down in a pool of blood when officers arrived at the house.

Officer James McNeil wrote that Liu was in the home’s basement and tried to “exit quickly” before being detained by officers. She had blood on her hands when she was arrested, police said.

Officers said they found two knives and a box cutter in the home’s basement.

Police ran Liu’s fingerprints through the FBI database and found no criminal record, court documents say. She was born in China, and police have reported the arrest to Immigration and Customs Enforcement. Court files did not detail her immigration status.

Neither He nor Liu are registered owners of the house at 10 South Central Ave. The city assessor’s records show the two-family home is owned by Zhang Tong Bin & Qiu.

A young woman answered the door at 10 South Central Ave. on Monday afternoon, but declined to give her name to a reporter and said she wasn’t home on the day of the alleged assault. She also said she was unaware of an illegal gambling operation.

The Wollaston neighborhood of quaint single- and two-family homes was quiet on Monday afternoon and the mint-green home didn’t reveal any trace of the alleged attack.

Three other neighbors shooed a reporter from their front steps and denied knowing anything about the stabbing or alleged gambling ring.

Information about the alleged gambling operation was scarce Monday. Quincy police logs show no arrests from July 2, but police said they accompanied two inspectors from the city to the house that day after receiving a tip about many people going in and out of the building. They did not have a search warrant, but were invited into the house, police said.

Jay Duca, director of Quincy inspectional services, did not respond to The Patriot Ledger’s requests for comment as of Monday afternoon.