The Oregon State Medical Examiner’s Office determined that Nadezhda died as a result of stabbing, KGW8 reports.

On Monday, Multnomah County District Attorney’s Office charged Volobuev with one count of murder in the second degree – constituting domestic violence and one count of unlawful use of a weapon – constituting domestic violence.

“It is alleged that Volobuev used a weapon to unlawfully and intentionally cause the death of Nadezhda Volobuev, the defendant’s mother,” according to a Multnomah County District Attorney’s Office press release.

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Volobuev is being held in the Multnomah County Detention Center.

It is unclear if she has entered a plea to the charges. Her lawyer could not be reached for comment.

Anyone with information about the case is asked to call Portland detective Rico Beniga at 503-823-0457.

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