The death of a 54-year-old Sturgeon Bay man at the Door County Jail Thursday has sparked an investigation. Deputies at the jail discovered the inmate unresponsive after 11 p.m. and immediately began life-saving procedures when they found that he had no pulse and was not breathing. Personnel from Door County Emergency Services, Sturgeon Bay Fire Department, Sturgeon Bay Police Department, and the Patrol Division of the Door County Sheriff’s Department were also called to the cell to help out, but they could not revive the man. No other information about the prisoner was released pending the notification of family members other than he was in jail on a probation hold. The Door County Sheriff’s Department has requested the Brown County Sheriff’s Department investigate the death with the Brown County Medical Examiner conducting tthe autopsy on Monday.