(Portland, OR)  --  Police in Washington County are searching for a missing and endangered man.  The Washington County Sheriff's office says 66-year-old Aaron Irving Renfro has a history of strokes and may be in danger without his medication.  Police say Renfro was reported missing after failing to arrive in Aloha on Sunday after driving from Colorado.  Police say he was last seen driving a 2005 Subaru Outback with Colorado license plates.