(Oregon City, OR) -- A 47-year-old man in custody at the Clackamas County Jail died Monday morning. When he didn't show up for breakfast, a deputy found the man deceased in his cell. They attempted lifesaving measures, that were unsuccessful. The Clackamas County Medical Examiner will determine the cause of death. The Clackamas County Interagency Major Crimes Team is investigating. They say the death appears to be due to natural causes.