(Portland, OR)  --  Oregon State Police are investigating, after the wife of a state senator was killed in a crash as she walked along Interstate 5.  Authorities say 54-year-old Leta Baertschiger was walking in the right lane of southbound I-5 near Grants Pass when she was hit by a truck around eight o'clock Saturday night.  Police say the truck driver was unable to avoid hitting Baertschiger, who was killed at the scene.  Her husband, Republican Herman Baertschiger, is a Republican representing Grants Pass in the 2nd District.