Walker was elected as a Republican to the Seventy-first Congress (March 4, 1929 – March 3, 1931).
He was not a candidate for renomination in 1930. Walker was preceded and succeeded in his congressional seat by the same person, Democrat Ralph Waldo Emerson Gilbert.
Walker continued the practice of law in Lancaster, Kentucky, until his death there on June 30, 1944.
He was interred in Lancaster Cemetery.