PONTIAC— Twelve Oakland County jurors now have the task of deciding whether Jennifer Crumbley bears responsibility for the 2021 Oxford High School shooting committed by her son. The jurors began deliberating Monday morning after Crumbley’s involuntary manslaughter trial wrapped up closing arguments on Friday in Oakland Circuit Court. The panel that listened to seven days of testimony is comprised of 17 jurors, including five chosen as alternates Monday morning after Oakland Circuit Judge Cheryl Matthews randomly drew their seat numbers. Those five will stay sequestered for now, in case any of …