ɪn ɑːktˈoʊbɚ nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi wˈʌn, wˈɔːkɚ wʌz nˈɑːmᵻnˌeɪɾᵻd fɚðɪ ᵻlˈɛkʃənz tə ðə nˈæʃənəl ˌæbɚɹˈɪdʒɪnəl kˈɑːnfɹəns, bˌʌt wʌz dɪskwˈɑːlᵻfˌaɪd bɪkˈʌz æt ðə tˈaɪm hiː wʌz sˈɜːvɪŋ ɐ tˈuːjˈɪɹ dʒˈeɪl sˈɛntəns fɔːɹ wˈuːndɪŋ ɐ dᵻpˈɑːɹtmənt ʌv ˌæbɚɹˈɪdʒɪnəl ɐfˈɛɹz əfˈɪʃəl ɪn bɹˈɪsbən ɪn nˈaɪntiːnhˈʌndɹɪd sˈɛvənti nˈaɪn.
In October 1981, Walker was nominated for the elections to the National Aboriginal Conference, but was disqualified because at the time he was serving a two-year jail sentence for wounding a Department of Aboriginal Affairs official in Brisbane in 1979.