(Portland, OR)  --  A Portland man who admitted to causing the death of his girlfriend's son is headed to prison.  OregonLive reports that 22-year-old Taylor Kraig was sentenced Tuesday to ten years behind bars.  He pleaded guilty last month to manslaughter following the toddler's death two years ago.  The medical examiner initially labeled the cause of death as blunt force trauma to the head, but later revised it to "undetermined."