Kristin Smart is shown in a file image. SAN LUIS OBISPO, Calif. - A judge has denied a prosecutor’s bid to file rape charges against the man accused of killing California college student Kristin Smart, who went missing 25 years ago.The San Luis Obispo district attorney’s office had sought to add two rape charges — for offenses they say were committed in Los Angeles County after Smart disappeared — to the complaint filed against Paul Flores in Smart’s death, KEYT reported Wednesday.The judge ruled against the DA’s motion and scheduled a preliminary hearing in the murder case for Aug.