An Oklahoma woman flashed a huge grin for her mugshot — despite facing serious criminal charges for stabbing her husband to death, officials said.

Shanda Johnson-Williams, 48, was arrested Tuesday in connection with the murder of her husband, Jamie Williams, in Fort Towson, according to the Oklahoma State Bureau of Investigation.

Deputies were called to the couple’s home Sunday after the husband was found unconscious, and he was pronounced dead at the scene.

The medical examiner determined his death was the result of a stab wound, officials said.

Authorities didn’t release details about the circumstances surrounding his death.

Johnson-Williams was booked into Choctaw County Jail, where she faces a charge of first-degree murder, officials said. Her bond will be set at her arraignment.