(Portland, OR)  --  A man who's accused of killing his girlfriend in a Portland motel is to make his initial court appearance today.  Joshua Carlson is facing a murder charge in the death of Valerie Johnson, who was found dead Friday at a Motel 6 in Southeast Portland.  Police tell KATU-TV Carlson was spotted in a stolen car and arrested hours after Johnson's body was found.  Carlson is scheduled for arraignment today.