Baltimore County Police have charged a Middle River woman with first-degree murder in the death of her 11-year-old daughter after encountering a gruesome scene at her home.

Keyona Dillon, 34, was arrested around noon Thursday when officers responded to a home in the 2100 block of Firethorn Road for a cardiac arrest, according to police. The police were called after Dillon went to a neighbor’s home and reported that her daughter, London Olsen, was dead in the home’s basement, according to charging documents.

After police officers found the girl dead in the basement with blood around her mouth and bruises on her body, they tried to ask Dillon what happened. But she was erratic, refused to answer questions, and declined to elaborate on the identities of the other children at the residence.

“Keyona Dillon was transported to BCoPD Headquarters to be interviewed, at which time she continued to display erratic behavior including exclamations about exposing child sex rings, transexuals, and the Proud Boys,” officials wrote in the statement of probable cause.

Detectives determined that Olsen was strangled with a plastic drain cleaner found next to her body. Marks on Olsen’s neck matched the drain cleaner.

Police said they found three more children inside the home unharmed.

One of them, a 5-year-old girl, told detectives that her mother had bludgeoned the family pets the night before with a hammer and her knee. She stated that her mother had placed the bodies of the family’s two cats, one rabbit and one dog in a plastic bin that she put in the kitchen trash. Detectives found them in the kitchen trash as she described.

The 5-year-old girl also told detectives she saw her mother choking London Olsen. She asked detectives not to tell her mother that she told investigators about it because if they did, her mother would be mad.

In a later interview with detectives, according to charging documents, Dillon said she believed her 11-year-old daughter had been having sexual relations with the father of her other three children. She had been arguing with London to tell her the truth, and killed the animals “to show Victim Olsen what would happen to her if she didn’t tell the truth,” the documents said.

Dillon told police that what her younger daughter thought was choking was actually when Dillion was performing CPR on London.

Detectives did not find any evidence of sexual abuse or any kind of sexual relationship between London Olsen and the father of Dillon’s other children.

Dillon remains held without bond at the Baltimore County Detention Center. She refused to sign her court appearance papers.