The woman, in the far eastern territory of Khabarovsk, killed her husband during an argument earlier this month about his alcohol addiction, RIA Novosti reported.
She told her three children their father had gone on a trip to nearby Vladivostok.
When one of the daughters and a baby sitter later discovered the body, the woman told them not to talk about it, investigators said.
The woman buried the body outside the city where investigators found it.
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