(Salem, OR)  --  An investigation is ongoing into the death of a man while he was in police custody in Salem.  Police say officers arrested the man Saturday night at the Best Little Roadhouse in south Salem on reports he was trespassing and causing a disturbance.  Police say the man resisted arrest and was struggling with the officers when he began suffering from medical distress.  Police took him to a hospital, where he died.  It's not yet clear how he died.