New court documents reveal that bad grades were the possible motive of the two Iowa high school students who allegedly killed their Spanish teacher last year in Fairfield, Iowa.

Willard Miller and Jeremy Goodale are charged with murdering Nohema Graber.

Both defendants were 16 at the time of the murder but were charged as adults “based on the circumstances,” according to officials.

On the afternoon of Nov. 2, 2021, Miller met his teacher at school to discuss his grades.

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Graber later drove her van to a park in Fairfield. About an hour later, two males were seen driving the van out of the park. A witness later picked up Goodale and Miller as they were walking to town on a rural road.

The next day, Graber’s body was found “under a tarp, wheelbarrow and railroad ties” in the park. Court records show she was...