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Jury selection began Monday in the trial of a 22-year-old woman accused of killing her husband by pushing him off a cliff at Montana's Glacier National Park in July. Jordan Graham and Cody Johnson were married eight days before an argument at the park led Graham to shove Johnson, according to police. She claims it was self-defense and has pleaded not guilty to first-degree murder, second-degree murder and making a false statement to authorities. Watch USA NOW to find out what we know about the incident going into the trial.