The Cook County Sheriff’s Office is not liable for the actions of an off-duty correctional officer who grievously injured her former fiancee and the woman’s father with her service weapon before turning the gun on herself, a federal appeals court held.The 7th U.S. Circuit Court of Appeals on Monday declined to revive the shooting victims’ claim that Sheriff Thomas J. Dart and other officials violated their right to due process.To prevail on that claim, the victims — Deisy Jaimes and her father …