 This caller then laughed before terminating the call.One year after the murder of her daughters, Lorretta Grimes publicly stated her conviction her daughters had been murdered by an individual they had known, stating that although the weather had been bitterly cold on the night of their abduction, Barbara and Patricia would never have entered a vehicle driven by an individual unknown to them, regardless of any discomfort.Joseph Lohman, the Cook County Sheriff who strongly believed the Grimes sisters had been beaten, tortured and murdered by a sexual predator who had lured them into a vehicle on the evening of their disappearance, died of natural causes in 1969.