A Montana judge has denied a woman's attempt to withdraw her guilty plea in the murder of her husband, who she pushed off a cliff at Glacier National Park.

Twenty-two-year-old Jordan Linn Graham of Kalispell faces up to life in prison on federal charges of second-degree murder in the death of husband Cody Johnson.

She pleaded guilty in December but sought to withdraw that plea this week after prosecutors recommended 50 years to life in prison. U.S. District Judge Donald Molloy denied the request as her sentencing hearing began Thursday in Missoula.

Jordan admitted pushing Johnson off a cliff at Glacier National Park on July 7 following an argument. Prosecutors say she planned the killing then lied to cover it up.