Prosecutors claim two Iowa teens murdered a beloved high school Spanish teacher for giving a student a bad grade. Nohema Graber was found beaten to death in a park where she regularly went for walks after school. Two 17-year-old students, Chaiden Miller and Jeremy Goodale, were charged with ambushing and murdering her. Documents show Miller met with his teacher "to discuss his poor grade" in Spanish class. The next day, the teacher's body was found hidden under a tarp and wheelbarrow.