(Portland, OR)  --  Officials say a man who was wanted in a double murder in Portland has been shot and killed by police in Texas.  Authorities say 26-year-old Colby Robinson was shot last night while trying to evade capture in DeSoto, Texas, a Dallas suburb.  Robinson, who was a resident of Dallas, was wanted in connection with a shooting in Southeast Portland that killed 33-year-old Dat Pham and 41-year-old Sut-Leng Chang last Friday.  Thirty-five-year-old Andrew Pham was critically wounded.