Blue Earth County is investigating the death of a 60-year-old Lake Crystal woman who died while in custody at the Blue Earth County Jail. Nancy Lou Antonson of Lake Crystal had been arrested by a Blue Earth County deputy on Thursday at 8:14 p.m. on suspicion of driving while intoxicated and drug possession. She was turned over to the Blue Earth County Jail to be held for court appearances. On Friday, at 8:21 a.m. jail staff found Antonson unresponsive in her cell. Resuscitation efforts by jail staff and ambulance personnel were unsuccessful. The incident remains under investigation in conjunction with the Ramsey County Medical Examiner’s Office.