A federal appeals court has overturned a Gallup man’s first-degree murder conviction in a 2016 homicide, ruling that the defendant should have been allowed to present evidence that the man killed had used methamphetamine before a fatal fight.A federal appeals court has overturned a Gallup man’s first-degree murder conviction in a 2016 homicide, ruling that the defendant should have been allowed to present evidence that the man killed had used methamphetamine before a fatal fight.