(Tigard, OR)  --  A 17-year-old boy who's accused of attacking a retired Portland police officer with a knife says he's not guilty.  Daniel Alfredo Ortiz is charged as an adult with attempted murder in the stabbing of the 59-year-old former officer, who was attacked while walking her dog in Tigard on January 2nd.  Bail for Ortiz is set at 250-thousand dollars.  He's due back in court on February 1st.