(Renton, WA)  --  The Seahawks may be losing linebacker Bruce Irvin to free agency.  NFL Media's Ian Rapoport is citing a source in reporting the Oakland Raiders will sign Irvin today when the free-agency period begins.  Irvin said in January he would consider a "hometown discount" to stay with Seattle.  He was the Seahawks' first pick in the 2012 draft, and he set a franchise rookie record that season with eight sacks.