Man charged with murders was quiet, polite, co-workers say

• Story Highlights
• Trent Benson arrested Wednesday, charged in four attacks going back to 2004
  
• Benson faces charges of murder, sexual assault, and kidnapping
  
• Authorities say DNA evidence linked Benson to the four female victims
  
• Shocked co-workers say Benson seemed happy but was quiet and mysterious
  
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