A judge in Arkansas has dismissed the murder charge against sheriff candidate Aaron Spencer after critical evidence was lost by police.The court ruled that the misconduct regarding a missing dash camera memory card was so egregious that it necessitated an immediate end to the trial.Spencer had admitted to killing Michael Fosler, who was awaiting trial for abusing the candidate's teenage daughter at the time of the shooting.The Republican nominee for Lonoke County sheriff built his campaign around justice reform after arguing that he acted only to protect his child.